Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2dfe5f941b00cc4…

MALICIOUS

PDF

92.5 KB Created: 2021-06-25 12:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4de81863cb0a34ac0e9b5084d942976 SHA-1: ffd33415fcd5aac7a287cdc38487cc4dc3a0a8f4 SHA-256: c2dfe5f941b00cc45ca4d12059bb8b893aa21c4f9c0bb9985f00b03392ada5fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with PDF-based phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b0bb435a2---xogamifubom.pdf
    • http://nextgt.eu/uploads/file/sawibivudumoduzizugi.pdf
    • http://www.contal-farmer.com/uploads/files/jejowofew.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8152109b1e24916c04fe029a1677fe2f/88959716232.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/bb621f4d345d79327a4313755bf2d2b4/66156579836.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608031b6bd16a---12549936647.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/74e696aae58d15b52731c34d431f16c6/984079047.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee56301daf---41892809898.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0348cc0e79fff2673a82fb4d86e50bef/75782250187.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/xaberavifasi.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/81ue81kvr4dcqd0ljb8sb51fk1/61713577257.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa931fc518f---98359763298.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/3a3e4f335347cbb8f5037014adcc6f6f/99846177246.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3d6bc8cb2af0c2a42c7cebdd428532a1/jupumavipirubirutodatep.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bc2b2224d---33182339971.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a221be3bece---61238681770.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607877cbdda04---jamotapufewodut.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=meaning+of+nancy
    • 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_off0001016f.bin
08f54931010b72baaf2ac2b87cbd4134c03fb358dc79de91babd5b9144ac8cd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 20716 bytes
font_01_sfnt_off0001362a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1362A 16792 bytes
font_02_sfnt_off00014e41.bin
1ea40760341dc26f4d67653c87b4a789d5ad5061be697ecd80855c1b683acc13
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E41 10208 bytes