Malicious PDF — malware analysis report

Static analysis result for SHA-256 e854e822cccd30a5…

MALICIOUS

PDF

84.7 KB Created: 2021-07-04 20:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cf1d626a3ad9a0985b9d0cde1eb5522 SHA-1: ec176e4c783708ce48c224ea1240e17f987c012f SHA-256: e854e822cccd30a5fa33322573dd3369dcee048c48cf958524fd7458dd667930
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

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://pistant.ru/uplcv?utm_term=11th+commerce+oc+notes+pdf+chapter+1
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/htaks357urp3qfn4ad7qi7gs0p/gebelopu.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/c03d28af2be2a7a102c027d315f2557d/27699248065.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/08506ef283aae22ff63527e3d58c55b6/woxalob.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7171dfa8e---36581588948.pdf
    • http://hainescentreasia.com/images/file/17466551652.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fupuwulumepupis.pdf
    • https://designclarf.it/file/vofixet.pdf
    • http://koszyczarek.pl/userfiles/file/talogopevonunebupuvef.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c0785398e847d73cc69e6ef650cf6237/81047573690.pdf
    • http://hubbardfamilycircle.com/clients/62940/File/63949371098.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/9f162983df1dd2e25d2ebaa1f7c066a2/87573909939.pdf
    • http://yaqeen-eg.com/userfiles/file/73605979803.pdf
    • http://dunajecbiala.pl/upload/File/rezamowanuzo.pdf
    • http://madmojo.com/fckupload/file/vakipozarowikew.pdf
    • http://giasuminhtam.com/Images_upload/files/44253114437.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/pakexidomok.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774a3bf834---76460849507.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b580923f78d68f952b175d19eeb44163/26485497060.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7d49o4aggem5oe5guhj3rjbk8n/pilonoviref.pdf
    • http://aite-materials.com/upfiles/file/jitawozaduzulafejon.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec4c25233a---vimenedozelobe.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/i14a23ksv3h6d9r3pf5iuctaa5/24730298824.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f2b43d581---58900579253.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b4.bin
54521431587a0815af4f1f8cc6ee3d20a01fe04046846342338ba23fb5019efa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 10704 bytes
font_01_sfnt_off0001011c.bin
fb1644f1769410c31d00860bb3698ee6e9376ea2b477b24c251f092478082ba4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 17040 bytes
font_02_sfnt_off00012d2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2A 16792 bytes