Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2aec8609bc831a6…

MALICIOUS

PDF

100.4 KB Created: 2021-07-01 23:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12f20d90660b808f12ed7087e5b0f3c0 SHA-1: 45291050263dfda5a5c67cf2092c97a19fb4b55e SHA-256: b2aec8609bc831a6aff3b23448d83e9775df4e51d3e4c22ab41f5520c8ac253a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of external URI and compromised CMS upload links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://coretry.ru/uplcv?utm_term=composed+of+meaning PDF link annotation
    • http://boathousebrokerage.com/userfiles/file/29083651522.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/pfgp9o0rbri5j1kebihspu0p92/93779129695.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/45539814417.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/9cb072eb8931e65cd47d3dcecf8840d5/30066107712.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/p18sbu2vdtbh71s87a27rcal03/36684661745.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/3eb7eb865ba865225626fddc20a9b065/65509591765.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/80582976331.pdfIn PDF document text
    • http://flexa.cz/docs/file/62430407082.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b2a0e83917797b0318fec82ca4bc2826/vajasatenugipapekuv.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eab82e2a8---54893007579.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7be0995a2---watutobeparipibaziretu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/34159084660.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/mloi365kmb4urg9j7gr1gl4pgi/35633692233.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071735ce2f1b---6680383447.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///fegogopebelipib.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/lirugol.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c6fdc2527a39c5a19613701082652e24/26786605296.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16072ea75188f7---telidizaxuwulokixovumek.pdfIn PDF document text
    • http://serenetransformation.com/clients/870552/File/96368647051.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792e574200f---jagofotizitasulodevewiwex.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/widisunaguwizi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a55dc555454---47125316862.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/25d96fa9b7e1628d63e3e9423e2f7f83/rukivoweruwekevemu.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/83236451788.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ecb2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xECB2 18540 bytes
SHA-256: 466130072b368bccfe14bf5c968d8b7a725c8221ed593c68086f253c7175535c
font_01_sfnt_off00010b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001231d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231D 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off00013098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13098 23052 bytes
SHA-256: f69fc27f1ee38ebb0462fd1f25c3c73023dfad6d0c7a6b88dda35fa357a46884
font_04_sfnt_off0001698f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1698F 10628 bytes
SHA-256: 37e0a70c3dec76bfd1ceb2e27436444b2a2e6f2bea7bb74ca20ed869a5496c01

Open this report in the interactive analyzer, or submit your own file for analysis.