Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b17050377bab64…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 09:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5da65224af189afc66336d63477e69f2 SHA-1: b09a52b68709042ac85e5256b2061993f558ba7a SHA-256: c2b17050377bab64657f28f1684a113c25be4e289c1ea8b138ae0cd0757f4734
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware delivery, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://studiolorenzoni.eu/userfiles/files/bokupibekope.pdf In PDF document text
    • https://cowichanseniors.ca/userfiles/file/93145100800.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/xazemajurudanekatixotab.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/0601184121eb309c7f4c4800ad3a5b64/91179961474.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/74681837591.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/12833161461.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/kufax.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/gibaxesivofukoxogox.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/vakajemoxop.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/43846952159.pdfIn PDF document text
    • http://kd-council.com/upfile/files/girinap.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/vosawosagiwanoras.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/63338155854.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/tegakebiradodula.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141bc0181297---mapejubezabopisibamovelok.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/busuluvapin.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/xizedapebenewi.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/40646984605.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/xomigofuwudojusu.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/zutejogefidesokuwaga.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/diruti.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1aac510b2b1714f4cacee143f07da582/kukalozopegemu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130319515dc5---29937795914.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/f1622ffd33c9220c5ae028d5f80ef7b7/47775732592.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/86294324375.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613379b9c2f94---xomunilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=extremely+loud+and+incredibly+close+pdfPDF 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_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 11220 bytes
SHA-256: 91e6233711959f0e57667d9f37e5ba719823c9b60b44b977710410eb2d2bc294
font_02_sfnt_off0001114a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114A 18412 bytes
SHA-256: 3e19aaa8f75b64e9dd58d4001779c6f804cd95b9de2fc999de7388ce143ca15b

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