Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b9447621790e0c…

MALICIOUS

PDF

94.8 KB Created: 2021-06-29 07:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 785e5a0c196cb4c342352cd013b2bfaf SHA-1: c60ef7132e70592a8a72398d286d29019b384d45 SHA-256: 61b9447621790e0c0b3f205d3214df94358cca73e216c93037a7ac62cc1e0549
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=meaning+of+strength+and+weakness PDF link annotation
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ab265a25d---13022847335.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/49b56733a6fdad885cc25e8fe494dd2e/94656985933.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d0d2542b39da0700458cd481d0855036/28361199705.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/xapudapalufepuwukeweman.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/74269260971.pdfIn PDF document text
    • https://grancom.by/upload/docs/29755836064.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/11541151149.pdfIn PDF document text
    • https://vestol.bg/files/file/15168016620.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/cf6d7b054be07ec67ab877c5ccb0b689/53899771222.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/73331588843.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tippljrmperhqd9rj2jkq4dps3/16214486212.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/4d78cb877d98c2071cd047f0f2f13ecc/15327232123.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885c06cb649---nikutufikuf.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-14/20210514201445562042.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/wagixixofudojuzabuf.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/sidiki.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1648131ee---gagorivareli.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4973869f2318eaae8cd9ef3f0eeaba18/matopivokivu.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/44960541911.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/da73bff4f22f2bd0bd221ad2ee9f432e/41597278171.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/f49119f04c252a2a92cb164675b68f92/viradanagajelulojeli.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/72985472334.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/570530781df123b1bbff6f0698683d2d/95738040841.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12847 10756 bytes
SHA-256: 8165660bc78aacb94e4bfccbc5a4398b4ca2edfc88e1014f4d33391e233b3157
font_02_sfnt_off000140d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D7 17424 bytes
SHA-256: 21ccbab18f4415068e72daa0a250d39f88dd0a8770c842565b36502191f6c6c8

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