Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6c443e61ad6378…

MALICIOUS

PDF

86.4 KB Created: 2021-09-21 18:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21b5ee75838f4adaab8e0bbcdb5de83e SHA-1: 6079080c0d1f086aa900e9a9efdaeb710bc0ce4a SHA-256: de6c443e61ad6378e69d94357245f2dd05d9bfbccf3e3f45aa83caf532bdd52f
176 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a callback phishing scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://mrpennarak.com/user_file/file/raxodaxetazimabalijaboko.pdf In PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/85072854242.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/84502495221.pdfIn PDF document text
    • https://tekartltd.com/upload/files/foxopafozigakesabop.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/sotomewojefu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f080e442b8---penenosedago.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/rimesatagasogepuzepevalev.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/59140833950.pdfIn PDF document text
    • http://secretinvitation.net/images/files/dujizelimezigaxaforefased.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/raparizafuninasu.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/60208721041.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/golamilovu.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/794106053.pdfIn PDF document text
    • http://alcantara.cz/data/file/80715571646.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bd12206cd6f7e6b4a33ce221567aeb43/16626264554.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/49489520046.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-20/images/files/xadox.pdfIn PDF document text
    • https://irantruck.ir/data/file/ledagej.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/18284121764.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c287f2ea53deb7462949f96490888775/73291503550.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/66890599051.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/joloxeludezafutoxiveruz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+muscle+car+for+drag+racing+in+gta+5PDF 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_off0000e94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 11104 bytes
SHA-256: b7a6ad98d11b30b3d9a43513a4d9cde8d40343266be8e8d018c9257e5e91bab7
font_01_sfnt_off000102ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 18760 bytes
SHA-256: 9b2d22484dc42a4ebf19945d633effd330326e19a5ef2755c76844d6990170bf
font_02_sfnt_off000133cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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