Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13b51d92e25461d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 22:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20c43c52e1f1e3c38734fd45584124a0 SHA-1: 49b4f3cf300f2d691ff0cc17d58fe231b47a6bef SHA-256: b13b51d92e25461d2c15cc8e687fb8776ffb256579c45eca36900c9471e39c52
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 http://backupcenters.com/userfiles/file/vuxotelilubob.pdf In PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/kegez.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/52528032618.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23159717178.pdfIn PDF document text
    • https://petek.biz/resimler/files/11978812923.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/17867256310.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d992ca117---87076481449.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16099d6f5cbb2a---79728147547.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/65932553884.pdfIn PDF document text
    • http://gibisch.biz/files/files/teditalod.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/78b36d4d9e0199f0f3deaf4d74d008f6/mafoderukumusetem.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/rozesenorutefewofe.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/bowipufidoso.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/89657338421.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/befajid.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052913024934.pdfIn PDF document text
    • http://mcutech.net/files/93841075823.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/kutubisotulebixusesogi.pdfIn PDF document text
    • http://nktrading.qa/file/files/37548892026.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/97398395737.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096536edbb82---venuxutivuluzagun.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/jopisarofexanubixegali.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffaceb40d1---9961981002.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611642b950a77---17930315507.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f088f076---lazekufuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dell+r640+specs+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC430 10408 bytes
SHA-256: 0b362c2ac452702287e4dbb4ab7cf6ac1a4fbe2c3a2e1cd66a8f2a0b278b43af
font_01_sfnt_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 19280 bytes
SHA-256: cfb10cf1c0cdf392525834dde0aa58210948a7a3dbc026fe55ee5c76bc8d5384
font_03_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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