Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d81a39b7fd6f5f…

MALICIOUS

PDF

83.2 KB Created: 2021-08-17 08:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6849d2529470ea747ecac279e83219d7 SHA-1: 33395c9b4cbdab52cb7ba520282338ba898db6af SHA-256: e2d81a39b7fd6f5f2c434fde27ff285ca3149b326c64800f7b998144989a4a64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the detection results point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=mp4+punjabi+movie+songs+hd
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/039873e1cdc85bf0252a2137652a68c7/dumewugivifenapejut.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942295098f5---lunerijapukaledupixiz.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/0p5djgcnal3pj1lm7d1ecen3j6/sizevudijoxapetizikivadu.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f89496e1ca0---33045476683.pdf
    • http://myconnect-thailand.com/image/upload/File/litobezesizelesotili.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/8ec2300cf103986e6b51b3b3350ad375/mofukupitokopakonurali.pdf
    • http://spalovnachemolak.sk/userfiles/file/dikapufatorirojog.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/vofikhfg8mle52bc87uq1dj1fk/77550532785.pdf
    • http://tscyw.net/userfiles/file/20210817065256_xmup8s.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/dea762de7f9fc4e04144b1ec82e8b49f/36474822922.pdf
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/wezijunepab.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fdeae7071---merebukonezanasetugevep.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/1eefe0f56965f4976b8eba56a4106dca/muvovepabix.pdf
    • http://eska-lift.ru/userfiles/file/94317459951.pdf
    • http://gelikonline.ru/content/Files/87774491350.pdf
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/tadazejikuxirojowonike.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607738720ab57---20358578708.pdf
    • http://gaongonmaiphuong.vn/webroot/img/files/96472100565.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f2358e52---98829621377.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4770643c16e771fba46c9b131b5bad31/vapuk.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/5acfa29bc340377e406e8275dd5fb416/sajadawovupuru.pdf
    • http://ilovehikari.com/uploads/files/fivupesuzovulowovolisemem.pdf
    • https://fototipia.hu/files/files/64473210186.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e03e.bin
b5229dee14da81bea6975e37be7a535c61836ddbd321404ec344f51f9a6c6d3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE03E 17040 bytes
font_01_sfnt_off00010cbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 16792 bytes
font_02_sfnt_off000124d3.bin
feb28d70a34e3897c954bb6eabfae827eced8740ba6fd16c01e998867bfde670
pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 11100 bytes