Malicious PDF — malware analysis report

Static analysis result for SHA-256 9029f23cf94dc717…

MALICIOUS

PDF

90.2 KB Created: 2021-08-04 23:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e770d6fab7770ae2ced791be8b4facf3 SHA-1: cd230e00a283adbc29c05fb2496027bab8f23851 SHA-256: 9029f23cf94dc717809aa6a14dff383bc7061342f058fc45ed15dcb2991a0611
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://philabc.ru/uplcv?utm_term=pa+ebt+check+balance+online PDF link annotation
    • http://maciejabramowicz.pl/upload/files/file/joxudejusodazulafale.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/21001714938.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/95d21f49c990bddf0f9bb54b6bb99e19/85398360774.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/winesepepapasefomilivof.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/duxabemimavokadokulewak.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/gr2l5b1l87vcbo5cini763n63d/lepizavedi.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2a2b44f59a516fcbb655c4ba62d8213c/nudijoropapitub.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/36mn52sv0fda296dp0q68kevb3/56743058909.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/74231cf1ca7f629e5bcf74d7e3d5c344/lujofeduvoj.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cce320eb59a---nuvevorigigerasibu.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/29957258601.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ef77179c7eb0653b57a615a1a0ff6102/48886798329.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210728044306_mrk7lw.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68a6f2ab88---bugezubedifoludababad.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/zudur.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/gosila.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/xoxarawosukowefutolu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/nk5572ekmet3np80uqruj3aiti/dibigifiludepevitula.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16086a7efafe4a---tawizovawusax.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c60c9fad08c---semuzi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ae74351e8---40349569208.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610055b8eebc7---nutelasudesufu.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ppuefb2jvpij6kud3d58u2le34/kekotavawiz.pdfIn PDF document text
    • http://ropesadventure.com/d/files/58182446081.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4fcd473cdde698ae9249aac5a7e56626/48781289487.pdfIn PDF document text
    • https://alutat.com/data/file/37577164676.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_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 10292 bytes
SHA-256: befe39e80e0c9b8cfc026355ad3f10cabe4c5fed6795367f5a207db55de7d554
font_01_sfnt_off000116f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F6 16700 bytes
SHA-256: 3a1005bb822f058cea22fc903b6dcf79c7587d6984dbdfdce036451b90add802
font_02_sfnt_off00014269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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