Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f029c2e9cffe1d8…

MALICIOUS

PDF

81.7 KB Created: 2021-07-24 19:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba4c502faad9d1c22d5ee6b01c1614cd SHA-1: 35569f5ea4dd9d935f4e1ce8b2e978ec82ab5a9c SHA-256: 8f029c2e9cffe1d8f1ebed31af863689de37d61a1306cb082d3939931c60db9f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm pointing to various PDF files hosted on compromised websites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://accesoriosalmayor.com/images/userfiles/file/79862969388.pdf In PDF document text
    • https://communeouchamps.fr/userfiles/file/xolarev.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/41560ab01f5c80e41fa7f7b203321c63/bejiwuvabujirol.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bda44744eda---zafulovumebomejiwen.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/fameruf.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/58524973483.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cddbdccda9f---42692747470.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/61859159102.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/tufafim.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/95226226999.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a376c6dfc1b226c5e9b043b1d28bd4ff/sonadorogol.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4dac42de2---28477174159.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae42d1c565---daponizolebela.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2371ef382---36101403647.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/4322592874.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ba0ubgapem8eh15j4mlcpbebj3/wadeviximakopobep.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/80702535850.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/8321719828.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/40193776629.pdfIn PDF document text
    • http://mebco.ru/images/file/gulegub.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/82aea8c3e0a83e75883d3f82e5760dc5/bitibotetur.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1d1f7001c4ad36c8d55f33ee8cb9d11e/rapinekesakopojaxisaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=deep+vein+thrombosis+treatment+nice+guidelinesPDF 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_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 11268 bytes
SHA-256: 514df71181d9bebc252a015dad8e8dae25e421db3e638b2a679450a7d5ff2736
font_01_sfnt_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 16276 bytes
SHA-256: f7fd6653468860b4c5aa31797533d03d70c4d6de3414d6a21ae46f057fd694e7
font_02_sfnt_off00011fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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