Malicious PDF — malware analysis report

Static analysis result for SHA-256 107345d90ab6037d…

MALICIOUS

PDF

73.1 KB Created: 2021-09-08 01:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b1f8a9a90cff15abf1eddafb13424354 SHA-1: 3f8f7d4703b21bcc2057f124995273b05d69574f SHA-256: 107345d90ab6037ddbd3cbfbd3a10576acc9aa6d0138bbc99d1a4f9a002e0792
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14dbbf2185---lokami.pdf In PDF document text
    • http://cohensevents.com/clients/74638/File/74187415011.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/sidopu.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/sasunobadi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/122ed59f154edd66d9758d03038f9200/81233797954.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/kaninederogijimesuvax.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///rigizisorefaxefa.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/gimitasakaxozalavad.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/20723087301.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/mamubefen.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8a0f7e18ab70d078e3724671e04406fd/41282258202.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210905010741.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210607_3094A70157EE9623.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e14afb797b---49756916095.pdfIn PDF document text
    • http://bastola.org/userfiles/file/49589555643.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b0e700bc30f7c60771e4f960159f797b/liguwivuvosoxelife.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dd65b5d1721---dugamafo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c731a290e11---wobanuzopi.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zokulokupukibun.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160983c8807852---telebek.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3bf75abda---54339718362.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cd20c1f5---57261983346.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160743849caa5e---10986075514.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/dotazotobowisida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=induction+and+deduction+reasoning+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD393 16512 bytes
SHA-256: 74cd6fddc9eb4be430c6d223a0f45c1046b95500e5e0254d40d6be8533a30e1c
font_02_sfnt_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 10800 bytes
SHA-256: a29465f8bb53d2c3b5bcafa76e838da74da56b9b2fcc6417b711074f633c8a2d