Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cb6b0558cd418c…

MALICIOUS

PDF

84.8 KB Created: 2021-08-24 17:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63ae8d10de926781cdbef537f359b417 SHA-1: c026522517cbeb0774b9417384bbc1c9b56e4f5b SHA-256: d9cb6b0558cd418ccf04d03425188d4d31535129cdab5d9fbf9b4366523a9802
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and presents a link farm on disposable hosting, likely intended to trick users into downloading a second-stage payload. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9fa854c2e7d66f4f276474cacebc093d/zorerumisavuw.pdf
    • http://myucpb.net/userfiles/file/kitijowis.pdf
    • http://aelma.com/sites/default/userfiles/file/ditipoxijarelivag.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75d754ce5---gelewulinumitefotamaj.pdf
    • https://soudurelausiere.ca/upload/editor/file/99668784363.pdf
    • https://comptables-publics.fr/userfiles/file/lizuxisilemipiguzamarit.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160970efb98b16---nozazozurawipidog.pdf
    • http://albarossa.jp/js/upload/files/120751224.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1212cd446af6ac377d48479613b7052c/pogojajelagovimaf.pdf
    • http://akcjonariusz.com/UserFiles/file/62164199984.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ae8a5aef94ef263fc158e7ad26182109/ragita.pdf
    • http://burnettefamilyreunion2021.com/clients/867108/File/43479415162.pdf
    • http://tochuchoinghi.org/files/1519195631.pdf
    • http://intelekt.biz/uploads/pages/files/piketomum.pdf
    • http://melly-incendie.fr/img_db/wosar.pdf
    • http://fine-trading-knotwork.de/uploads/media/24486923334.pdf
    • https://dursunguney.com/userfiles/files/99996580394.pdf
    • http://abwalabamaave.com/uploads/files/64009795488.pdf
    • http://baggiez.net/userfiles/file/15345917028.pdf
    • http://nutranghongngoc.com/media/ftp/file/sorubugisiditadotunobusod.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/bf9ab39dd22e3da87d4cdd2df942a894/mineg.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mathtype+6+free+download+with+crack
    • 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_off0000e040.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 16792 bytes
font_01_sfnt_off0000f857.bin
4da4833f9c31ebf2517d6fe43f51fb45ee6536052e0edf607531fc3647df63bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 11004 bytes
font_02_sfnt_off000111e8.bin
b007210aef6acf4f6379b0e3772b3b73c34fc26f0b3fe2e036d6e9855d0aea66
pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 19892 bytes