Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d8dd2a9b15072f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 21:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49ddbc209844e2cf3ff8f6ed694c277e SHA-1: f611573659415e29b481b841cc3f55c1cfca1558 SHA-256: a6d8dd2a9b15072f66c751dc472e9061bca61c15cfefc58ece68219312dcd236
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to potentially compromised websites and a deceptive download button lure. The document's structure and embedded URLs suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.companyforte.com/imagenes/editor/file/17662066604.pdf In PDF document text
    • http://seowonbattery.com/files/fckeditor/file/17986378456131664e7658b.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/16139222187.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/52032003403.pdfIn PDF document text
    • https://nomortiga.com/contents/files/komufibapozetojivowujuwit.pdfIn PDF document text
    • http://sciattella.net/images/file/tagija.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/rojobuzavigiderale.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/72964504050.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/wuxogowonipumudemagorones.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/10047765907.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/54515663746.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/72213917836.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/konuwibiwad.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/8405594848.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/fisemenolenorer.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/sajigawawowobomodazetitu.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/gikulajatojelogovulixuve.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613441f44b003---27177418746.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372af48c87e---vulefofularosobu.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/9109134001.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f446807a---xosinipifadegebasewafibu.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/39758566396.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/63721205261.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/89750022629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=forza+horizon+4+android+without+verificationPDF 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_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 10724 bytes
SHA-256: 445de17163a21df0be553ab3f7fc559402e097acac891e3c7c4ff3164602aa92
font_01_sfnt_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 17720 bytes
SHA-256: 3f06da5dd966a767116e2b86bb75fba57bd566c7531cd52bf0205030530eb574

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