Malicious PDF — malware analysis report

Static analysis result for SHA-256 329abec72406d9f8…

MALICIOUS

PDF

87.9 KB Created: 2021-08-06 14:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a15a3200b33653efc586ccedd9b14d9 SHA-1: 82a8f7fe8275da8598171833008c004b25c7b7d5 SHA-256: 329abec72406d9f861afb561d3677979d2fa73a100121d8488601d0397d458cd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms, suggesting a link farm designed to distribute malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1febcd20e---66209715870.pdf In PDF document text
    • https://karinbentum.nl/uploads/file/bexalibutofosokigep.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160817eb79ec5a---53908591892.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/ripovonogisedenurek.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/votiluromituponesakisoge.pdfIn PDF document text
    • http://orthopediedelft.eu/files/73687904569.pdfIn PDF document text
    • http://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/lesigofofifofasevixiv.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/22cd594d5a3bd9757d06c3b776564ebb/8779331467.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/62908832356.pdfIn PDF document text
    • http://mesterek.net/tmp/rowodizevatedo.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///1367904719.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/43357365527.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07c3d15aad---20183472618.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077e34c719d8---lusugirufalurilifugow.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/99473185503.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/66510643361.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9716f2824---46323958737.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/4901147181.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3br819pggr5lgn0fgqe91vl7g7/11382211988.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/5408940375.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160771cd988a3c---vipubixugapezewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+long+can+you+get+for+attempted+kidnappingPDF 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_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 17408 bytes
SHA-256: b6753c4d6d2eb36a92c877c888495810fc8e1ced2a24449fd000f274ec4b59e9
font_01_sfnt_off00011cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFF 11176 bytes
SHA-256: e7db79a6d122334f7ca7649bdd0caa40e0996b1f2be322b39f79f8634c68cfa7
font_02_sfnt_off000136fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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