Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f88242c269e05c2…

MALICIOUS

PDF

93.6 KB Created: 2021-06-30 13:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7dfd7675eb2a53499a5671f4a3d9797b SHA-1: 755fdfa63411d39ffcdfb2db4db14d731c40bb57 SHA-256: 7f88242c269e05c2170b588b1b3104ea60111bd92b4ce4f9dda5bad7beda1666
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://inwebjor.ru/uplcv?utm_term=top+indian+companies+in+the+world PDF link annotation
    • http://kusadasidentalclinic.com/img/userfiles/files/zusunabeviduruxered.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/47623045424.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/df95dc9ea2078e684072893bc5663c21/xedajukodebosuda.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/24310396854.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/91661101846.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfbe05e926---gurenukixikikopezudula.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cbae0e7d6b6d918956578c07f4aeccc6/78503036997.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073874e7fdcc---kilakivoditevoxulisalomib.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4af875628---bifepuduvijanoboda.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/buzigepegolawijo.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609832591c579---rusomekapapupumiv.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3d2a4aa5c---wodepasunupekuliji.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/18679741857.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/996fme2bo0394b83e2b5dk3il4/tilavoxasewomovejo.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/39284801157.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lonekuna.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9v7d0ce3h5bv6ffh51slib5gcr/sigefokefevowerojal.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cn19p01d22hngncfhohs7bc2r3/93474383520.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608873445ee64---28006236191.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/zumaluzotomoxuwe.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810d6b00fd3---16680805747.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/4639047015.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d71aee46343---ravapulosiven.pdfIn PDF document text
    • http://arslanemlak.come/file/61950407654.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/55687903617.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2618464083ee9cd1fec9ab7a25320118/kojazurafikop.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_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 17388 bytes
SHA-256: 385df95b68b3eaab5a0dd8c6f506a2b38f02808cc3a1019684c358f85da836f6
font_02_sfnt_off00015005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15005 10828 bytes
SHA-256: 6fe9b1f2f88294c89ceada04203fa949bee25b3ab5b0e77c232d2bf9a9584353

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