Malicious PDF — malware analysis report

Static analysis result for SHA-256 13759871bf286abd…

MALICIOUS

PDF

95.9 KB Created: 2021-07-28 01:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d160b3dca6905bec04a8ede45093646 SHA-1: 0d21cb74b02374e8f556a053169814f07a52c80e SHA-256: 13759871bf286abde3095340ad2ad28dd8234bbf77a12d9511bee306cd620f0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/62e61e34775a34b2f4d800014b3d6551/risidekuvawib.pdf In PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/db7f183d6551925baac5dd19c761735b/59066575679.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ab1a14df---93946380307.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/65355892571.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086354f2e81a---zelexaxumepane.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/xepepovagun.pdfIn PDF document text
    • https://edgecs.com/documents/lapitaridagid.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/9ri2d0qsph3pr4qo5p9kn6uldv/82886486194.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f8a16c86---kejefudotamabegibemosaje.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/97528098162.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/221065a67bc49aafd6a37434a817aedb/sotixisiwixejefuganoke.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/sojawozubuxelu.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/fadaxuborolakego.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c997b292cf3---navekabewop.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/20710825981.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa107b1a9f---29940598203.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/ccb2pm580lpvhhefs0et418dn7/26045106192.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809f6fb1b1a---457385967.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-18/20210518021938771364.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/85581236706.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/pegokusiluzegenit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+bench+test+an+ecmPDF 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_off00011290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA2 17880 bytes
SHA-256: 7c949ad302bb0f88e7b3e3b70096419bedae68cdc2a459697ee9241cf31abcc1
font_02_sfnt_off00015992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15992 10476 bytes
SHA-256: d0bac1d3a1618960ec31b3e62c51f75d15ac7523cd1e53eb0c2d5d3ca1c69855

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