Malicious PDF — malware analysis report

Static analysis result for SHA-256 106f60af73563f6d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-06 00:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 36a091a1a0c2f5583b19f981de650297 SHA-1: d6b53af67e9760cc4984b40712cac514d6d17ae8 SHA-256: 106f60af73563f6d7dbf9e148a6950210b8f932bb8dd26df03c3be520a0df628
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a clickable action, designed to obscure malicious links. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://collegium-connect.nl/ckupload/files/91256018642.pdf In PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/7913115383.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/saziwu.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160987fb1ab3ce---zivobilumifumunuke.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4792f4e2---lixulerobexumenesu.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/74796585229.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/69be1a34689abb34c56e8cf36ccb66f4/laxadisaduwirawi.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105181555434295.pdfIn PDF document text
    • http://honda-vo.com/upload/file/nerijavulutomufizejuzaro.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/kapiwe.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/wiwodagovepijigarok.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/fexasusos.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ldfuh0o8p4910td699s1603bn6/pijoletopugofazupaseso.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/31376133054.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/08/10/56996343419.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/79789207633.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/vezikutabazo.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/23853956079.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/subekidigikoputub.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/bajazafowujotudigeje.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/toteputivomezos.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/uo461694de7hctnojuk9aai0b5/35658369429.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda1b28a1b---68410982864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=one+and+many+printable+worksheetsPDF link annotation
    • 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_off0000b346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB346 14364 bytes
SHA-256: a87e9718a5f209f2afe1553df438f3f7518bde000f5ebf3808ac15c332ef1617
font_01_sfnt_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 11116 bytes
SHA-256: be9ef2bc91009b995b8859a359f9792040f5cf86f9f8936dd8eb1060cbd3c295
font_02_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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