Malicious PDF — malware analysis report

Static analysis result for SHA-256 164061250aa5f25a…

MALICIOUS

PDF

92.1 KB Created: 2021-09-05 23:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 62c2f1cec8935ec180a2b80cac7a2182 SHA-1: 90b31fbc88e30c8e7b12e512ef13f171a907c8be SHA-256: 164061250aa5f25a8b9cc09c9f214780036b408bec1d6b9a2d2e45699887662d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/p73tipciu6q8mvglgl937ggcot/vudek.pdf In PDF document text
    • http://allycatering.com/userfiles/dofes.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/pawotiborijewosufemago.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/xuserijiwoxufakekonafinop.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/fuxotukun.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/64965995988.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/90139123073.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/7dc1e799854ae58937049ab4c5ab8d18/vifog.pdfIn PDF document text
    • http://epmachine.ru/d/files/39754706174.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973bd66abb3---96985814493.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/15139412546.pdfIn PDF document text
    • http://strandedtattoo.net/file/97701825651.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/99941225435.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/dadfe15badb0e67f9d36ca1575c05189/78121383657.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/miridutizokavafi.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a32d2ca275c---91799536843.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/7608681478.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/5964046426111a4181d4f6.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/29108815875.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/28363655526.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711ed55bcbc---14112148807.pdfIn PDF document text
    • http://retrofotr.cz/files/file/70614160921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=simple+machines+worksheet+grade+8PDF 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_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 17532 bytes
SHA-256: 77e4b799bef344ab1d79eb82e80dc914ecadccd611ab7e8937a923474923537b
font_01_sfnt_off0001302c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14843 11420 bytes
SHA-256: 458e38c670112f67325c78a2c5362203b124494ab61ee30dca662f7722780be9

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