Malicious PDF — malware analysis report

Static analysis result for SHA-256 675d0bbf34115b61…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 05:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8df58753b1e27c6fe074b3332a77d8a8 SHA-1: cf040c1661c1eae5bc8a3d6ee6aabdeb6063f9f2 SHA-256: 675d0bbf34115b61abdab11c114f04ebcac90ec51f07d7436a892bd320d8b0c4
164 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to potentially compromised or disposable domains, likely to facilitate the download of a second-stage payload. The presence of invoice-related language further supports a phishing or scam-based attack pattern.

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://arhstroi.by/uploads/files/44128266780.pdf In PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/69021005352.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/25071306368.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/826c21eba8332aa4f9f3f30c5a7b0089/98357261005.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416719b7ca6---92748824684.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/sudox.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///92985469628.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c9c17f2bacadfd547fa19b20388fd4d6/tuwafo.pdfIn PDF document text
    • https://superpart.com/files/58217289590.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/ponomusofuxopamanupitese.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/fasunowevu.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/51216464246.pdfIn PDF document text
    • https://activepymes.com/pub/file/turibipupiporuxaxoxevu.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/vugimixow.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/soxobipurofino.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9d5170c1---fexurewinalixetepebumaf.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5ba8e8271df7d862ce82186691755f77/57044865100.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/77977104228.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/razopotopazorasododabegij.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/17799745195.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/wanakisalijujizaba.pdfIn PDF document text
    • http://strandedtattoo.net/file/zorazewa.pdfIn PDF document text
    • http://skisun.it/userfiles/files/15015608556.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/nirizalef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=billminder+for+androidPDF 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_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 10300 bytes
SHA-256: dc71600181bdf4f2001e6d3ab5868be62b38575b9f4fa4e9d07baa40e4cfc075
font_01_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 17652 bytes
SHA-256: 15065beacbf0d9d406ba23fa851c7c2e8ad38bf1fa05a85d073781dba5fff4eb
font_02_sfnt_off00011ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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