Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a96488eebc31650…

MALICIOUS

PDF

106.7 KB Created: 2021-06-27 02:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 02212ee239ea3619cf97e1c8e4492fb6 SHA-1: afdac754cbe703ad84bfcaeee231ab456ff1b7e9 SHA-256: 0a96488eebc31650a081a3388bb5db3c76003c33edfbc6082cd3762ce29ec0e0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external resources, many of which point to compromised WordPress upload directories. The presence of a PDF_RANDOM_URL_LINK heuristic and the ML_NYX_PDF_MALICIOUS classification strongly suggest malicious intent. The primary goal appears to be directing users to download further malicious content from these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/67a6cf22c9cfb9e9af016d8e06909025/2574896892.pdf In PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a8fe6cfeec9e2faa91b91b269e1bca0/barazufated.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/14429213793.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/39167325183.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/diduzuluriwu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/8eed50311a35017091e1925f7a53827e/xuvizupud.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a52d066fde0---nagulimowidovapikilali.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/totewiso.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/f8cbcb39be716ddc5317547c9eff90f1/zedamimobilazepewuxonufe.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56675df3ef---65632843752.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087eb5566944---57525680578.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/boxisifelabato.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae53db2ee1---latezef.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a085a787b8425bbcb55b92d383e749c5/10954782875.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/65330372562.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/95ff65c7bb675e8c8d0ad629ad3a4a7a/ralufodomupu.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/39864676712.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/pokunipanulaxutugofagadim.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/5303ed462cfe9fd993a83521228ebe9b/farapirelipumivofutekel.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/zamewisegakurunuxuwad.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b98581581b0---12586468556.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/00998803acede08094048cb62d9f66ce/wonegusog.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ad8d4223009f0d9a7af72ab19643dde4/musiwogevovevezat.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/59063771374.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad3af0103d---23581394221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=123movies+deathly+hallows+part+1PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 17364 bytes
SHA-256: d439520db4738d7ff956b537fbc553db029726b5f2a6f285a88616a6915ae919
font_01_sfnt_off000130ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EC 18688 bytes
SHA-256: 8feb8eb8265fc8d5639e2208780b11823b382db4c72bd80971c00deeef3a321e
font_02_sfnt_off000161d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D1 11068 bytes
SHA-256: 14a54f83ec6064c58d3dc6ba1f622e6f7c7c19d3ac59fc9ba9f8a01f85408ca4
font_03_sfnt_off00017bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000193cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193CC 1784 bytes
SHA-256: e56bba586f25b7bb331306cce9154593ee2e022724dfd3cbe2c17502343e7eeb

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