Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0ecc20690a7d8b…

MALICIOUS

PDF

85.3 KB Created: 2021-06-10 00:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d34bb9612c17458ab8ad19e1240b49f SHA-1: 722f6bc164f9777296497a30ea08d52d8011c7b4 SHA-256: ed0ecc20690a7d8b3a3d2c7806a9f9c31e0dfceb70072f3b8d71c74b4bc48e3c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=learn+korean+with+bts+book+pdf+free+download
    • http://agcslohian.com/userfiles/file/69678310299.pdf
    • https://amursvoidom.ru/media/files/mejewetalu.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160947dd65a9ee---83999025762.pdf
    • https://dm288.com/slicice/file/51855846366.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/kl3d6bg87djomcpqdlrfkmars2/jitiwaware.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd05f427885f2beca586e6051bb9c3c6/95420937328.pdf
    • http://aweibel.com/Photo/file/nilezefobixemelego.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/3dckmloepi78fklms5p1lo6fh8/82342811382.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/uc5hftg104mcv4kebc5d3inv4d/68746745017.pdf
    • https://carsen.sk/editor_uploads/system/files/48452183663.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65c4f68b21---lamuxewexonumajof.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7pg2ipr0guhe94q62t6imaok4r/55392302709.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083703a77cbf---88888074809.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/d1f05218e1ae934dea2094723764a627/68151623465.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011030.bin
4818d4a0419dce2586f9e3ad1e7946b6c63c00ce6e18e75364b0b4d3d776aa30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11030 5364 bytes
font_01_sfnt_off00012280.bin
85722d7f50bb9418b6114cc2d76c113105677596865584750775466cb383b11f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 11060 bytes

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