Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2f81df59fea36e…

MALICIOUS

PDF

92.8 KB Created: 2021-06-26 06:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9f49313ca5570207d77e6b32c793459a SHA-1: 82fdc2d9be51cbf9369b5d094c57664802a5cd58 SHA-256: 3d2f81df59fea36e1660bd70b4290f3b0e40bc2afdab060efa737a0dc10aac54
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting multiple URLs hosted on compromised websites, likely to trick users into downloading further malicious content. The presence of embedded URLs and the link farm structure suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7112336cb---26855055444.pdf In PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c57b67d4a---34161105326.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb5a87c231---47611201393.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/72559441301.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609238353ad36---jijunubivawe.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/62660855135.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/marimare.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/fbc6ec1596ca7c1aad74bdd5d0555233/73703090201.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a19bde56492---2978594584.pdfIn PDF document text
    • https://petala.gr/userfiles/file/redadivumekik.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a4446010844---suwilusidalovijuxuw.pdfIn PDF document text
    • http://adveotec.com/img/file/jozowizatuzinobevew.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/594d89746d990b7c990787e53cd4ae9f/towegasaginomexirifemo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607872497ebb6---bidanogulivomakiridu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d09d3b136fef5b337146d6b07b615c67/jageval.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac423b39705---sofovafejukopitinonejado.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076344199f07---2212082448.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/10769915377.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/78123810370.pdfIn PDF document text
    • http://temple.mo/userfiles/file/16175326087.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/vudaxuzasanupuziwe.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/87302092883.pdfIn PDF document text
    • http://cpils.com/userfiles/file/xibakapu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089084580ef4---87755867414.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/kljj7khi83toieccmj5a9ms0m7/dabazavudum.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/voloxigubajagulafusaxemu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c3f7c20e1d2c678c2e6ec8f58688ac63/10693043343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=early+stage+corn+on+bottom+of+footPDF 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_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 10824 bytes
SHA-256: 9b474026f423d5e7038d8733c9eabd0011e3d80a4ac6a6cebc827ca2153f73d0
font_01_sfnt_off00012161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12161 16864 bytes
SHA-256: 1d6b053dfefb6689a5577b5ae6e2bfe5189183b550959cd59de162fdd612f166
font_02_sfnt_off00014d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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