Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7eb8473c4c33e6…

MALICIOUS

PDF

87.3 KB Created: 2021-09-06 10:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b8d78bda3bcb039db8996e16ecd2c7f SHA-1: dbea45e336be19ba3454eb530adb9da145281991 SHA-256: 9a7eb8473c4c33e6122892c37f0b46ea4222af0ec849b10c1603aaa35f32de85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/vejgo416vdq11446gp1flj0bq4/lorudefas.pdf In PDF document text
    • http://onfireinteriors.com/userfiles/razafuti.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cd41284378f---ribawaxigixakimurexiket.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/78319559051.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609479ef256e0---wodaxowaxebaloxusapada.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/83054905711.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5bfb0bce098fa59dd0f547f606ebe400/85788188199.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/17b72b0aad6858c683e4481321348df4/bibulanufigafapupifaruxuw.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/ketudigixigurefetuxolabo.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/32671522316.pdfIn PDF document text
    • https://andrejc.si/files/file/nipufaxebibi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e354167212f---fofikexuxipifi.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/17414084549.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/62cc6a65b53bd6dce710ee165d587d78/xowug.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210810114808.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/24896255249.pdfIn PDF document text
    • http://prestopc.it/upload/file/fenewerexokezap.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/80d3a4fcc7806ad46e1e1059c6a01a51/88175395373.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/28800781092.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/16631119786.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/36a96b509ae6bbb50800b28473f2fc3b/finuzewalodirapafowobeba.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/jabunudexisejilomivaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=online+user+manual+examplePDF 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_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 17264 bytes
SHA-256: 212762bfd30781878896a4790edf2c2ec94228c91fb4b210bb4030c92909bbc1
font_01_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 10424 bytes
SHA-256: 2181d0cdca9c4191833725ec9343f7b4e384f9d48b78ff529297721a9d5a7c8e
font_02_sfnt_off000137eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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