Malicious PDF — malware analysis report

Static analysis result for SHA-256 601e013ff93f499c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 02:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cced30b1c7ccbf980cbeeed68e8ddd7a SHA-1: dc4d7ff62e8d39139fbd51a8c0cdeebda72e5069 SHA-256: 601e013ff93f499ca1c673dce8bb26ae74ce22cb71de13af027e4a3f00d94737
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 compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://files.ibiza-ferien.de/file/desilekasir.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d3644b48---rodelixoboj.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16140e456b8b66---55593986760.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/80580302718.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/kebifokotolif.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/8779343314.pdfIn PDF document text
    • http://strahyi.ru/images/file/kimuzasek.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132225287084---kavusolamal.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/tomawalafusevilepibol.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1d8671dfa---76085033290.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0a33d73ae---98793977656.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/94217609749.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/bixitikege.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/84144592601.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/18933488925.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/darivufigubakutodaviwozi.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/91470305683.pdfIn PDF document text
    • https://protum.se/file/57753273461.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/43232814551.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/95282644357.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/sasasetime.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/21874123405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=crazy+market+apkPDF 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_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 10180 bytes
SHA-256: 753f5ed5ea38c81ef295cfd759966a5ba4938d268764706cd7b561827f81be78
font_01_sfnt_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 17084 bytes
SHA-256: 73d792e3eeb0f310df9bb167d71ec9e00c87912149a450fa8baac618fa2bd144
font_02_sfnt_off0001245c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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