Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d5457304157f08…

MALICIOUS

PDF

70.5 KB Created: 2021-10-04 03:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 57805e497c45c98c71690583de3a5263 SHA-1: d9fed1c9a226cf4a94c5e967120ef3a751e8e901 SHA-256: e3d5457304157f0891e1175dc27a2f2c86a4cf05fa39352461f7c065e1636dbb
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The document body is unreadable, but the heuristics strongly suggest a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://myrbacken.se/login/ckfinder/userfiles/files/joxazawu.pdf In PDF document text
    • http://aquatherm-graz.at/files/54419221775.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143cdcdcefd6---revowemudagox.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/96315143711.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109200805517541.pdfIn PDF document text
    • http://email-database.info/userfiles/file/37504055458.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/40946708553.pdfIn PDF document text
    • http://apex-architect.ru/images/file/rizediv.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d74a1b2920---18130620079.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/92532616949.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/zafalokiporepiwe.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/lalumizubopago.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/48391222011.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/nemevizolusubuson.pdfIn PDF document text
    • http://fluorescent-training.com/file/borebajeritapav.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/puvilomewexalax.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/sofitir.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2c1951302---95876582104.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/zewizodenilufowub.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/78159568468.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/51700893108.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/64009625877.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/87524358428.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614944cf404c0---fotexin.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/31837303870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=finding+your+own+north+star+pdf+free+downloadPDF 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_off0000b19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19B 11056 bytes
SHA-256: 37ee47cee5b5588e2f8b276e38fb27e72439f8a13e5c8d2b238a3c251156b0bd
font_01_sfnt_off0000cb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1B 16116 bytes
SHA-256: a0cce5acaae3ce1d0bcfdfa488b76247ba03252db75d039e26325b9a494d950f
font_02_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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