Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9779e2419bc027…

MALICIOUS

PDF

78.7 KB Created: 2021-06-12 17:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6f466f4ff1328c8ef681bf93eaae1711 SHA-1: 91195a20505aa950db52a79fa451451500c5b014 SHA-256: ff9779e2419bc027791add69bff8d5180b1e2456b3df5e08901075aa88d5610a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or redirection mechanism. The embedded content, though heavily obfuscated, likely serves to disguise the malicious intent and facilitate the download or redirection to a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=goodbye+gumball+lyrics PDF link annotation
    • http://szao-spb.ru/images/news/file/dawizasariv.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/i2v49lp00bq475gt2lnepspdn0/zupiwipadidakiposuwogex.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/oqrs327jsjrvom8oooa2koh8jf/jujisijevimagedexilomo.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/e732e11e990aa2388cdefe96ad6ffec9/rukarekoxudaviretijeb.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/19135300119.pdfIn PDF document text
    • https://termofriz.rs//files/vopesikokajibepudelezal.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/p7d9eo3btte6hu6eg11fvgssjd/mexak.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160706b1787599---topali.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/vs2m69gaav5gv9ne06oppbi7ir/mojusotesagotofiruxivig.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/uq97d9nei5gs2im6s8mta79t03/nasudopobudu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c3a04089333928a222cf763e86d102b7/wiwumovutixapatiwonepofo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f566fbd8c1---gubaxegugufalabuwanusuze.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ib94hfhbuskd01o96ufbn9fnl5/kozozazaxewi.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/gelopivesusorezolawu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7575cd8c8---19660362553.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file/%5C/seginofusolebirukutatixi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16097c01a831d5---78572328716.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/xafefodumazilusovumu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB37 7616 bytes
SHA-256: 927df635fbcd2a8410028482cc25abd732a7c9c377c4b090c5eefcb907da5f26
font_01_sfnt_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 5532 bytes
SHA-256: 80f1e1a0791b18626360ddcd95896d0253bcf044022fea4b98db7ee914af94ca
font_02_sfnt_off0000f1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 11536 bytes
SHA-256: 910d6538e9722726ad319d751ee30debcfc3f28f5f2090f26847ed60428042ef
font_03_sfnt_off00011821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11821 16132 bytes
SHA-256: 4f6d6443d667672870c38ce4e1d364e29e61a0df6fd2d8217a47270b9fff04c9

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