Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e96264f8e3bffb2…

MALICIOUS

PDF

233.3 KB Created: 2021-06-29 14:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b5fd5cf946e06860c7b0573ea6f3195d SHA-1: d2f42360b52f6a828fee8bccdc9786499bea593c SHA-256: 3e96264f8e3bffb202d72da01779aa319b7840dbc3c7c3d19498162d4e634da0
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and SEO redirectors, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing campaign leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/e07d2b915be7f6f2904aeca7d5675f68/26719604448.pdf In PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6924de1934d858c1967c813807665fe6/37343207305.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/gozuzilaliturijexowoki.pdfIn PDF document text
    • https://okazionche.com/files/90090967910.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/mf1dafo8gc3i3tocd6kp48a5p0/mutebovefumubedadapinon.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608347739cfdb---73293967803.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/sudilawavefetipidikiti.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ce0ac98be3d630a5b1e4f911e4cb5a3b/goweva.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb1a7eef03---sorago.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/kfhck7c46adll8nslctd3bul52/nobemizamozidu.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/cr22t7ochnkn3ormfmv1qa97tk/18311411448.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ac2e48903243fbe01a202bc8d671dcbf/tutikalelo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c21f99acc---kuzeputidulakiserizutej.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/29523872239.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b38ee1b00---rukam.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160896b242c8e4---nogagisexuwuvujozagarered.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/7cmqkbk1ag63kagojfoavp4r9t/55479037188.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/mufexebobex.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/08834b0cb2f0ec64d1af2a64614a2c9d/13841821130.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce2bf40d27---poxoxazek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=big+4+consulting+firmsPDF 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_off00033551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00034d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34D68 10616 bytes
SHA-256: 80c8a20e599b20fc1dbfeb6b5ef54e8ae11726f8753042df9cb453f88ed09055
font_02_sfnt_off000365be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x365BE 19520 bytes
SHA-256: 7155ba7fa865967d0181b8ef727e6064af826644d91acece6ad9edce4a54184b