Malicious PDF — malware analysis report

Static analysis result for SHA-256 3411e414679f2698…

MALICIOUS

PDF

88.9 KB Created: 2021-08-13 09:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f545ffa3f59c4c422f257dbbde47112 SHA-1: 88c674a3b2000f5b7ceddaae6131823836b56449 SHA-256: 3411e414679f2698c7a34e20cf8a54d5d76701fdd639e350cc9354e280416dec
176 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing lure. It contains numerous links to potentially compromised or disposable hosting sites, suggesting an attempt to distribute further malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or scam attempt designed to trick users into initiating contact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://lube-stc.com/ckfinder/userfiles/files/mawesivolejal.pdf In PDF document text
    • http://novichiha.ru/pic/file/pesav.pdfIn PDF document text
    • http://tencanpowder.com/d/files/nizumu.pdfIn PDF document text
    • http://kasargod.net/uploads/file/wibevufajerurifilatunu.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/27462592408.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/61991387109.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/69541080370.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a69c3dec82---gekukivexatujupufobut.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/bifalovowij.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/46916158210.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/1709583882.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-27/20210627235754996396.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74536a5fa9---39673464776.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/27eeb778721708cd4041b87c85f1610f/ligun.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/baxituforadavodereb.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/83782069491.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/0700d8bf354683cf571dda16ead75de7/fulegozarimamewedeledo.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/33276820255.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/sofofef.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/zumaxolutufurisu.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2a6ba2464190eb56411ba41726cf23f5/bezimajulofixegunomi.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/lomebeguwalowolaf.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0dfdd071571d93a786303541447e0d11/puvejufas.pdfIn PDF document text
    • https://menu2uplus.com/images/file/29958124046.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fcf798459---92565370542.pdfIn PDF document text
    • https://digireg.at/upload/lukasunojamovabimajedolet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+i+top+up+my+british+gas+prepayment+meterPDF 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_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 11224 bytes
SHA-256: 955b5c8929d9b005c8b612ca17f70c2b834e6125799784e0a54d7caa9a3c3745
font_01_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 17976 bytes
SHA-256: 4504b927a1fa35ccfa4a153afb43c2b5937585e0bf557ebe950eb5f9186c4f65
font_02_sfnt_off00013b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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