Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09225ac451bc0df…

MALICIOUS

PDF

74.8 KB Created: 2021-08-30 16:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28ec6ad91f7896eee3159870847958c8 SHA-1: f3ad3b90d5da982159058b7f833e363cc5e6abbd SHA-256: c09225ac451bc0df7f03950ee214dabc669a0e87115ffa2c39f2f0b57b0eb226
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a non-clustered link farm on disposable hosting, further supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=position+to+velocity+graph PDF link annotation
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/niwituzejadejafiven.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/19834681536.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88578d9c95---ditige.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/9f1468d701f38e39d7d5eb32aed3e1dc/dexekimi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dbffe759b---kopakebev.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/raputika.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/09scajs9djef4quil64vkif6sf/ludijorawidubivu.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/13771554347.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d354ce76cc574227ee4477399da83fc/nesusutubos.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/caf8931457111a7a6b319a9cba87446a/48942231463.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/furepeponutipuwer.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/2649240038.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/ripefuludadesojiraru.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/befegewuwirevinibadil.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5c725f28bc49cf24dbadf08fcd722c2f/9544501155.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/23550080371.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21fc8e08b8---webilavatefarasuzer.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d19055bff5427177a37b67fda10f37b6/80513718252.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/6d90upkfsfjmpp6adbr0aevif2/zibamubefafojikuputiposoj.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2e47395213e0bbb37e12734f9957c233/23953552556.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/femikerenolib.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/wijapebigijef.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/57358509327.pdfIn PDF document text
    • 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_off0000c0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EE 16880 bytes
SHA-256: 60bb930524d5e992945a861a926f03016e80e8352cbfd5e9babd235b687c129f
font_01_sfnt_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 10836 bytes
SHA-256: 17de8b7a4a892f7497135195a4c227981283edb78148cdf772fde71eb27494eb

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