Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a158edc3fcd4fb4…

MALICIOUS

PDF

70.1 KB Created: 2021-09-03 13:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 61183765d72b56bc57294b4813f562c3 SHA-1: bd48421cbecabf8dc588a7d5e7ca7f2000fad74f SHA-256: 3a158edc3fcd4fb4ec62c691da10d7f4768877dfe2a2e0d69be9bbef298c00c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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 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://leebyunghun.org/new/upload/board/files/nazikofudojerezipinipil.pdf In PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021052402505473499.pdfIn PDF document text
    • https://orsolyajuhasz.com/ckfinder/userfiles/files/kuzefosakoleguvizalij.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/mogetawoxexorilowodosune.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/81022044704.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079c27c6492f---80724304425.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6c937bda8d792eeca316aebc133aa0ab/77418323831.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/48867980134.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcdba3e705---67427281142.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dcaf044b0cc---rorisinizuxekof.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/bujajibisuvunufo.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/3325afd45e0f2717dfe75c667a079c7d/79702536394.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7bb6a7e3d---46054123882.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/51c5f38443d5c8b6d2d3fe9884362966/tusikeneruxivoposal.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/wegeriwosanenodubafotapok.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/ravavonuvemafilonoxuveju.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/43757869558.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/buvawijabimaribipax.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5f673fdf---rujufezuruvujem.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/49310326488.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/wejitibelilogakupire.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/solepo.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/litomijolunomisoramisipaw.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f7a7b54be---kipivokenaxotukap.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/91155250753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=months+of+the+year+worksheets+for+esl+studentsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EF 15016 bytes
SHA-256: a0f0745a05ace4fc075a07f6d0aff9ba8bbee0540c33083e25c526c5658ded26
font_01_sfnt_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 10744 bytes
SHA-256: 0cd764d9b601cf5389334bd8b60d186febcd1ca09e7e31179784551eba59bc71
font_02_sfnt_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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