Malicious PDF — malware analysis report

Static analysis result for SHA-256 978b79f3e78d7361…

MALICIOUS

PDF

89.7 KB Created: 2021-08-14 06:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5585b77ea650ee78c51ec52ecaa6d521 SHA-1: 75f3cf3d3ebae01576250298a65025fce02cd11c SHA-256: 978b79f3e78d7361f1a78699df22c2b78f021df1c5d739eff7db5abe12d1ca56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The heuristic firings indicate a high likelihood of malicious intent, with ClamAV specifically flagging it as a phishing trojan. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://irlanc.ru/uplcv?utm_term=bluetooth+driver+software+for+windows+7+32+bit+free+download PDF link annotation
    • https://thuaphatlaihanoi.net/uploads/files/gakomipisamerexexok.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b45e58fb2---53089740450.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/da78a0d4ce76ece90202b6d346e256d3/15999568204.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/gazojuwekelakelal.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/etqr5mvsl98vtggk55g7ik9gf0/18267871174.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/tmn377jsgptdq4upn0hmumb09d/99544898016.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/bapugodawokol.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/aaa6efa053a51d891f326bb467371344/26677197719.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/92793941797.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/42036941778.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/cbiclg9bpff13bbvoo4ijp04bq/xarekipakovurakifatudim.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/30652756545.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/zubimozikijodixomarenopo.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/13923056497.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/29980229201.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/sidogukeporijuzozoxejuvap.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/jagigajasagigamifas.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/453a52c55b9e1eef357ea140ee26e4cb/52015211004.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/58248530971.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/49763514384.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/pakedolofone.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_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 11240 bytes
SHA-256: 049785fd59c49d09fd5bc2664bf6b04bbe63a306f12b9f0d6d748e629787b77a
font_01_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B44 16976 bytes
SHA-256: 1fcc5fb7459fa9a880cb024fbc5902716bc62ba0749ac3fb0f44e8d6e5d81465

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