Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac32386ae0754d3…

MALICIOUS

PDF

71.5 KB Created: 2021-09-20 11:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e3a04a2492110faf6c68563d280a2a7a SHA-1: a4ae59c11dafb211ca0730a1da5af61c447355ba SHA-256: fac32386ae0754d3f9e34eaf79b3d1d7d28d74388b805c5c46850ee5f7871198
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, some pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b69f62aab3---53223712147.pdf In PDF document text
    • https://deltaguvenlik.net/userfiles/file/93731574162.pdfIn PDF document text
    • http://lukinserv.hu/file/depasonomomedovozu.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/fomevotibujajosotuw.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/bululoraribixide.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/52605796727.pdfIn PDF document text
    • https://unitjaya.com/contents/files/19791276549.pdfIn PDF document text
    • https://tekartltd.com/upload/files/xutebikisenubemoxopikuz.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/jusopadi.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/waxopilirovanamu.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/tijibonapixas.pdfIn PDF document text
    • http://riph.pl/userfiles/file/rufubaloxeve.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/15104691422.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/94439814049.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/55577f5dfa64df36b2f6734675b76689/33468415260.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/bevex.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/69243734213.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/377c7b4201372b802cba9825f3f9b608/38211832441.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/pamusabolaperifuwilafe.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/giwabamiz.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/24564031517.pdfIn PDF document text
    • https://funbugs.ie/files/file/nunez.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/bivolevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=alcohol+in+chemistry+formulaPDF 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_off0000b580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB580 10796 bytes
SHA-256: 7f80f6e48692589a9db4ecc75af54fc51b3cbb9cc2130493514e452485b7d404
font_01_sfnt_off0000ce40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE40 17000 bytes
SHA-256: bce2568fb1b065e1e5806b2a573809c350b49ced87e4213fc8943d248332e892
font_02_sfnt_off0000f85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1