Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90262d44c80f4d4…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 20:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0168e7c11284e48034d9f32a011ce0d SHA-1: 0fdf067866b393c9f8f23e893e81017b455a4b61 SHA-256: b90262d44c80f4d49b6bbcfcbc258a924b0a1eb697b308498b7b2b71796dd6ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves luring users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/8327638458.pdf In PDF document text
    • http://lucchetta.net/userfiles/files/94073202282.pdfIn PDF document text
    • https://denimder.org/resimler/files/78203188026.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/24128436048.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/17333390556.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/45449297938.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/28659554735.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/31139485618.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/jokepuxavujekososativi.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090801174173499.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210907223741.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319aae6d287---gukurudazapava.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/af2da1c3b389b36e9c3ebf337b1afcde/10803956262.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/70852962843.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/fegilewe.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/997ad4181f93185f66b858c523915a44/61009777231.pdfIn PDF document text
    • http://szpk.hu/_user/file/bixojutowokibijobipexomog.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed8654dde7---supemorakibo.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/fojidofobeziratekisepod.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/93480927263.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06d507cfc---rijizafoniwajen.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/6349019708.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/66112029200.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133c3f1eec90---49177931529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mission+berlin+modPDF 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_off0000d8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B9 10280 bytes
SHA-256: 68dc69a119a8de982c395966707f1ade6fe7729fc156b9bb81a356f002e9ddfe
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 21136 bytes
SHA-256: 459e3890d87799eca4536b31a249d323096a22e4e74aa3c1b33efe6e6f636e92
font_02_sfnt_off000127a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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