Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22cb17a54257cd6…

MALICIOUS

PDF

74.5 KB Created: 2021-09-07 16:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f40278483ca01fcc025bb2bf6ce5da7 SHA-1: df5c7b223cbdc0ff4b9bdcab584cf8f277349e02 SHA-256: c22cb17a54257cd6225711a457a061f4b83faf0ba91cc2a08ae8492cd53065d9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/c9d897a2cc11331fea6e88c7eaf042bd/51842207970.pdf In PDF document text
    • https://baxsporthorses.nl/userfiles/file/xukupajifosesopevobasise.pdfIn PDF document text
    • http://chinazzjx.com/d/files/31216558682.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/63710918a552e03a61721c3084268524/wekudopoxekugo.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16099a3cfb0af6---63564831292.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cch6hdtlusni2apeggi8s2e7f0/vuzoxexufumanenikug.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/rexajakefoximudawegos.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/idcgtoj7l23s8krdccvji00a9p/32134869070.pdfIn PDF document text
    • http://prosquash.by/data/85064509224.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/navuraxagizubaradumusa.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/cafdc5c93b078518b123ffd6d8ba3843/4451511384.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb6b42fc6---bibepiv.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/siwixavitiwonojaw.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710a153ffae---58819844264.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c2518a943---27984217819.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a261cdd6f80---93370140427.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/ragali.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6201a437d---87042766893.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/10374570096.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d82d24cd33e---pisaperabajejug.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/nusudizaw.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/46c6f15a4afd97eb2bdf00a710629670/8971816699.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/63737508389.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160721f119bcb8---8988266601.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/edfomkg7u7lq8p066a02i72h7n/totufojudugasaxilimefov.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607586cba06df---2324454273.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/5633392013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=trulaser+5040+manualPDF 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_off0000c2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F2 10356 bytes
SHA-256: c40c0dfa2ae3e90da885dc702cbb42a2cc6102faa5be6df32ef14ce65827c93e
font_01_sfnt_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 16440 bytes
SHA-256: 1c5d6b257e67175375a963c5fc972f48ae11267c56d8c1bc128e0c6fff4cf3e3
font_02_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1