Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d463825cc26a50…

MALICIOUS

PDF

83.4 KB Created: 2021-10-10 09:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: b5ea8b7ea218434f97b5acd5e75b636d SHA-1: b1fef7b357db0ff213a3c1d643d20ae3fe88ffae SHA-256: f6d463825cc26a50a8a4a10e170ab807bc60423e418446371509e9b240c91e5c
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various URLs, including one with a raw IP address and others hosted on compromised CMS uploads. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cftckr.marketsearching.com/upload/files/kuzefinaruwunalut.pdf In PDF document text
    • http://palestraarkadia.it/userfiles/files/muzanitidilunumolaloxi.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/vuvodojaxejewudefir.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/34191520538.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b1c48fbff---40914947400.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/cnlbnbo8ir6hi14ghlj9mu2d70/6108733763.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/94403308538.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/q0m13umdrgjadfugsqil92utrs/fofetoruvebizukix.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/85215871608.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210905_040915.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/80351882853.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/19840126590.pdfIn PDF document text
    • https://vzglavniki.net/data/file/degukuteki.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///gamakidatuvumawok.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455c2377fa0---jebinimofij.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/sudate.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/92327605327.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/65637288703.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/96241755936.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/15293138760.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210902020708_849263428.pdfIn PDF document text
    • https://ptogel2.com/contents/files/pudutuzomefu.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/78224031778.pdfIn PDF document text
    • https://fishboat.hr/files/topomamutupemab.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/90301006906.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=prost+bar+and+grillPDF 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_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 10432 bytes
SHA-256: 03820a0dfade8c8a6d3a3db5f72c3d76d2c49ed00e34206ab88ae0584c0875af
font_02_sfnt_off00010b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6A 20056 bytes
SHA-256: e33e66341487f4d5002b11e0141a23687c244afcdc6fdaff6a66d563b188057b

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