Malicious PDF — malware analysis report

Static analysis result for SHA-256 41036cd2e7236d24…

MALICIOUS

PDF

104.6 KB Created: 2021-07-25 11:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e9ca2e956222dd7aaf1885f64e2b354 SHA-1: 120ed53875ed6c26b8ec70b2e900b16f94e57fcd SHA-256: 41036cd2e7236d24667ff61ace80730990a4c3250e2c0bf635c6642f7063b880
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to domains that appear to be used for hosting malicious content or phishing lures. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://careoncall.in/userfiles/files/miwogovarosuzekeman.pdf In PDF document text
    • http://wannawwannie.pl/userfiles/file/46438123462.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/87368275784.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/jejir.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ec08ca60c---xomizeg.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7vncj7ppb14ur36n7uvr7nnoq4/juganebasabu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pijozotexelaku.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/5743055576.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f731d0fa7c---noduxan.pdfIn PDF document text
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/novutura.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e501f6c0fc---sepudupogava.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/pokujon.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/t41l5o064vmjn08o6dbqdorqei/wuzebojuwafevajimorusu.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7e87815ce---42168179680.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/97576684956.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/vemivekogud.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fb7009a68---93933595910.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/cs7n4mf31lhnk82j173p2q67i5/87214854183.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/9883058229.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/74253729861.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/58622921285.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/180166171360ccc81d4f33f.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160882c67a2371---53859082387.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/o3nllnigo1g8lr2ol4dhh64isr/19276462461.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5588925823c05d5a887b771b8ee51d05/19027921786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=le+petit+chaperon+vert+tapuscrit+ce1PDF 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_off00012503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D15 25220 bytes
SHA-256: 3339685cf1522f00852ec3f9ed9f5abca427caaf35ebceda9144743eedb9d61c
font_02_sfnt_off00017a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A45 10600 bytes
SHA-256: 5cb3f1398cf842f6cc40867cf3d76f5b65aff8c851f6c111317373c0b594d79b