Malicious PDF — malware analysis report

Static analysis result for SHA-256 524486eab2939374…

MALICIOUS

PDF

178.5 KB Created: 2021-07-16 15:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3caed62c5f62aaedec0752868baf0ef6 SHA-1: 4e81943883851c53f09bf93c2fa75f24719940a1 SHA-256: 524486eab293937488f6d2270f30f3c34f3e46e670b7417056b000b0eb2a4fe2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malicious content delivery mechanism, evidenced by numerous external URIs pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics suggest the document is designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9738

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://catamma.ru/uplcv?utm_term=dial+up+port PDF link annotation
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3d706282809e50f11ee69d4c177d5945/sowojukuzatarimixekipoj.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/68428113548.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/977cd91df906f05a4b0215c2daa07064/juwafigi.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/nujenusuwopipolamo.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/45253072034.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1010882e9---28769969411.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01569b310a---98014948637.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/dcceb2802239cf53d112a200bf9a3a6e/dizopejupevi.pdfIn PDF document text
    • http://boratohumculuk.com/ckfinder/userfiles/files/jinadaru.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a00683b083c---pajofafomemimin.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/89338422955.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/eade6d65ab85da0d9c769aabfa37f543/32391240589.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609797ca820f3---zowafizosimuweri.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/19405b9b32077d7ff8a2227b1e4b3fc0/17077445742.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/vagebutufisuzewegi.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/silozariwinefofukivi.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/gisoxokexilejupaj.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830d375593a---fibuvirapibifesuzokusisem.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7970453ab21fe1df939c4401c30eeb51/nudigokejom.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb19864dee---90408100756.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/2l8af5qbfnrtse0ulcn39s5grn/noluwanisupebajeruju.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/86d6cc13b00a07c3dcd795ed70318e27/82363930746.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/8e8502701e3d4722a1dd277a4356362b/joxefinulugixi.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/24442309686.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a43644b49a0---tipotajupuzufafe.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/vixiwexewixuvoxu.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_off00024d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00026544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26544 30788 bytes
SHA-256: e5d19910b375670904301f06fb706cb4e4c8c8cd7981fcb370eccd0fd9cb7e0a
font_02_sfnt_off0002a4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A4F9 9940 bytes
SHA-256: ea4e572c446fc7d83c1cc4bda76ab1c3d4cd09b2eb37dfa12a7d6b2b4aa21ee4

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