Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea731b995d7a4d0…

MALICIOUS

PDF

68.5 KB Created: 2021-10-02 23:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0a6ebcb05b4cd0fadeb597b20af034c SHA-1: b6d8b61d6d08c5c537b5ae67ee952f75e85900b6 SHA-256: eea731b995d7a4d027f5b8b3a8446b8c0a4bc3efa7c12c8d799ffed1b280bb16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, which is a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were extracted, the structure and URL patterns suggest the PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b3c72d1d1ddf9df9c853d13767b139d2/xazapipegikof.pdf In PDF document text
    • http://sk-uralstroy.ru/uploads/files/69766781614.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/luwafejubadimino.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444a1420344---wikodipimimosuxu.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/47982679401.pdfIn PDF document text
    • http://kientam.info/uploads/userfiles/file/39554084489.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zudidijuboved.pdfIn PDF document text
    • http://imi.vc/upload/files/58270935099.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/gotaroviju.pdfIn PDF document text
    • http://www.abitacolointerni.it/newsletter/file/kevemuwoxage.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/livevatikijurelenu.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/kakibejawenuzepakadepeti.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/jususatexadarojex.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210928231247.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/wopok.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/12415389669.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/92753236120.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/gawigowifaduniguboges.pdfIn PDF document text
    • http://medica-brno.com/files/8046921084.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/vunibikonom.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9833f19252ed94ff8c8440fd116e9d53/sotiretojabodiv.pdfIn PDF document text
    • https://nasikampung.info/contents/files/47917210357.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/5395785923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bank+of+america+acquired+merrill+lynchPDF 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_off0000ae5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5E 14832 bytes
SHA-256: 8e1d3461c807fd27eb954f36f1321c464c85666ceecb419f2929343c238187bf
font_01_sfnt_off0000d325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 10980 bytes
SHA-256: 439631248eaccf70d233d4fd7eb9d8d41e07d738808ee119568033213a998c73