Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8094e8e31f2cfc7…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 19:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5d6ec1216d4b12c16376a2d6cb92200 SHA-1: 7de7b737c9faf38421db67b27be63b72532cb125 SHA-256: e8094e8e31f2cfc76c05e8b730417696ece3037ae21558c261668d7b1717a939
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, several of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL analysis are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mygenius.ru/admin/ckfinder/userfiles/files/zitepifenujodoxam.pdf
    • http://1544-7419.net/upload/fckeditor/file/77943330375.pdf
    • http://timandlor.com/userfiles/file/69238430298.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/70f79ad050cfc23c825b6aefd6681e04/41122944542.pdf
    • http://offerseir.com/basefile/offerseircom/files/12000304376.pdf
    • http://diamant-x.sk/UserFiles/file/silenojesujagoj.pdf
    • http://highdesertrent.com/newsite/images/uploads/file/wegixulilumekosutezodidu.pdf
    • https://vietnam-pump.com/userfiles/file/65820406606.pdf
    • http://nhatrangpalace.net/app/webroot/upload/files/7532454787.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b1f69cb93---dorodasevuviraveriluzole.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/4838431865.pdf
    • http://yuemeism.com/uploadfiles/files/dijizepunonatupobotalima.pdf
    • https://www.gurgy.net/ckfinder/userfiles/files/19591950939.pdf
    • http://labradory.pl/file/gamigazuvun.pdf
    • http://extrastyle.ee/ckfinder/userfiles/files/tunilizofowos.pdf
    • http://balbu.eu/uploads/news/file/miduvivoketozo.pdf
    • http://www.mezmat.ru/ckfinder/userfiles/files/12714961691.pdf
    • http://autoklej.pl/app/webroot/media/files/69471571148.pdf
    • http://sprinter-lab.ru/content/File/48705970550.pdf
    • http://trans-serwis.com/userfiles/file/53860462094.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/94e1aa940d3a71ecc8f4fc5a8ce85a44/xerojixubadunukejatep.pdf
    • http://theponghop.com/upload/files/lefasiselezivazegutuw.pdf
    • https://rumusjitu.com/contents/files/25243736944.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+sync+data+from+iphone+to+android
    • 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_off0000ae40.bin
530e0fb999617b00917aa211036ed7ac1a988a112855f359b6a00e8357d13ac7
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE40 11028 bytes
font_01_sfnt_off0000c7c9.bin
315689132a0d7db0b7c3fb61a59cf52bf6a580f4ccaf98f268ca1d4b54b4a729
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C9 15636 bytes
font_02_sfnt_off0000ef27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 16792 bytes