Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7333953b0d1d6db…

MALICIOUS

PDF

87.2 KB Created: 2021-06-28 19:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e66b040c84e4d04841e725a6a8fd5c3 SHA-1: d2a8448bbd5e8672095da4d11476d80fb66daad5 SHA-256: f7333953b0d1d6dbf76875f49e7e62e2b1edc5974e8b5daa458f97e3d8b2893e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting. These links likely serve as a lure to redirect users to phishing pages or download further malicious content, aligning with the characteristics of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://allytemp.ru/uplcv?utm_term=carmelo+anthony+lincoln+continental PDF link annotation
    • http://rubivina.com/Images_upload/files/88390766171.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/moefrbcc7ub9ih1sk6hd2jvj9k/29135926232.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/90382178638.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739c1e75f7e---9637718674.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/puzapemigeva.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/18879245518.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/3lm2v933q43j4ta8vunljo7i8f/30423529218.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/27970273876.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccf37c73b2---remekobar.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/tkb0hskc68k8krkiq471led9tt/pixebodes.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/bad7d141f6b6f29e584e4a104c08a337/86010515207.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/48500361940.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/km1pkb6er4s4l595e7dp8f9lk5/12325452911.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/jutelegaridav.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607731cb348f1---89339961067.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/78133685078.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/virufemazixaj.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fbeae59f---resuxuf.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/9998957366.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/18338323136.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/b96c14b7535a02fb211eaf581c0fef50/66345349647.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b140cfbbe239051fb0d76cdc03e81ae1/24527411367.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f89a5121d---kajeg.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607475581f6fa---tapaboboxojebodujuk.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/16755026258.pdfIn PDF document text
    • 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_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 17912 bytes
SHA-256: d37c977c2bc396a0a6a7eb1a3ec7d7ca809183acfc655132d286863494ed3a15
font_01_sfnt_off00011db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB9 10472 bytes
SHA-256: c9e331dccb365906895c32a9ae7127092c7420dbb481e4d1a6e91fa19abc7e63
font_02_sfnt_off0001354d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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