Malicious PDF — malware analysis report

Static analysis result for SHA-256 3963c4af1f3bb35e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 07:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2b86d00b8d1dba8d679b76f5de5e61fb SHA-1: 494f7f1e6e8d4f75dcd3d863e8cff39cee22d410 SHA-256: 3963c4af1f3bb35eee4796d3b3716cf176e5ed426082021364ccc08eb7ecbe8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the conclusion that this PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=nomao+camera+apk+free+download PDF link annotation
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/rajiriteseguluxaga.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/dabujikupamaruvatisubop.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f7dd84d301cf52ff08f4ca663dd5146a/29963115606.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/9783711606.pdfIn PDF document text
    • http://spakimthi.com/upload/files/66771091253.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/53371175924.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/rukatidopuvipojuwenepel.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/kesemurukesiwuvuvokimabof.pdfIn PDF document text
    • https://tekartltd.com/upload/files/foxopafozigakesabop.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/wumoluwavu.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/86273101310.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/didowemevogowonivu.pdfIn PDF document text
    • http://winso.tw/userfiles/file/11570858388.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/63115717731.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/fewogodifu.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/62699381328.pdfIn PDF document text
    • http://domplus.su/userfiles/files/57159347914.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/51825209557.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614432e21f441---83675400449.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16136cdfb65fe6---zoxotetimufekejodadotaf.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/70665446805.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/92046888037.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145721f97360---93829819369.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/99140089106.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_off0000d6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 17744 bytes
SHA-256: 3c26e5ff609865852f6f29ff084a8d9f28ed91e6002619b1139d33259aafdd92
font_01_sfnt_off00010501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 10580 bytes
SHA-256: 753557c68a18c85623e956b1d863c117bbfa8e784d9b9e5bc51511d124b4e8a4
font_02_sfnt_off00011d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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