Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c86b1d1829da1e…

MALICIOUS

PDF

108.1 KB Created: 2021-07-07 01:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebe9d971401a9e9d7a13a9b2a32bfcd8 SHA-1: 205df6331720f9d59647d0e08b82a20a55ee5b6b SHA-256: 55c86b1d1829da1e489df9f88f22bc2d59c9558e3c6104752c5c23eba1aa7d65
176 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous external URLs, many hosted on compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of a 'lure' heuristic indicates the document likely instructs the user to enable macros or editing, a common tactic for malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://laborke.ru/uplcv?utm_term=man+made+resources+in+the+northeast+region
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f0abbf0639a51db6541ccf7b496e57bf/60295545311.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/15e70dd8dabd8b931dcfb09e46e26d1b/momabamiva.pdf
    • https://atlastoursntravels.com/userfiles/file/fifetuwowokijoxulu.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5899253e3---fabuvafifesadipisu.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7c68a8ca9---45111170403.pdf
    • http://ajtoablakcentrum.com/_user/file/kedazunuxavanotitolojop.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/ac0f2f4c84d07ade3c3b5396bc04f790/42595952227.pdf
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/lavobizazurajesezopad.pdf
    • http://wildpflanzen-planung.de/file/27923113921.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/96ff8876b034c58d4e9b17e4bf6d5bce/gobedubalato.pdf
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/muwesubanefedita.pdf
    • https://hophamthaibinh.com/upload/files/86225905039.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2782c290e---97736989718.pdf
    • https://advance-pack.com/editor_upload/file/88816459834.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9bc979821d819f95802a32e36084c1c7/55850393909.pdf
    • http://www.celso.org/download/25894267167.pdf
    • http://ankurgroups.com/userfiles/file/lefikanekuvumam.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/llmkb23sbeuk0qp4a0shp3nogd/kimipedolajinipix.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/7ce45243d076fdf8852178fb43f8fec2/ferojiweb.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/978bb2ee9d86cd03cfe12666ceb864a2/nobazutudopi.pdf
    • http://fastgood4cheap.com/clients/4890/File/54443605094.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7dmepa2f8s1ffrs91bgpm3vrs/nowaro.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_off0001468a.bin
ba5a18a58255aaa5fb239ab84c9f3ce694ef331365b6545169a5849f3bc92b65
pdf-font-stream PDF embedded font (sfnt) at offset 0x1468A 16852 bytes
font_01_sfnt_off00017288.bin
90fafc030261b89b4a74ae8692d69d1fd389afcb8456b6583dc1ff2d342a54ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x17288 10864 bytes
font_02_sfnt_off00018b36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18B36 16792 bytes