Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9465eb339ba87b3…

MALICIOUS

PDF

84.1 KB Created: 2021-06-17 06:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 07a4f8f21087d500032e8011df7aaff8 SHA-1: 5c001b09cd7afff03ad8cb917b2af60f02b3d37e SHA-256: a9465eb339ba87b306f4282b109f5485dcb342e395eccdfdd9ef1d77ff495b7d
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=mod+for+free+robux PDF link annotation
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/voan249olf1do1gi59k1mh72sf/83461089851.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/mjilip9960asvv2jf710trfn60/1696813625.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/271c4c8e30a6be38f845d38c91f971e2/75955036241.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/kuravizinomawonaxin.pdfIn PDF document text
    • https://loctra.net/userfiles/file/10681836201.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/856a7af9098ffd9f0d60cc2cb7dde443/rawikosonagodorudugen.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078ba73ba42e---92358080250.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/54015931735.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ab383e385---lakikevakozataludili.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/ralonorepamolokiduzamegi.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/c667663e02d5555594443c47502f01fc/zarosef.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769236381f7---ratemawebizud.pdfIn PDF document text
    • https://farstaslottsvik.nu/anvandarbilder/153/files/27223687364.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/118dbce3f45b91fb1efd2b6fb5e8bdd9/bokisogabita.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4d40706f47b06fcfa0871abea5616805/nepimagadu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608e08c4159f8---nutubuxopon.pdfIn PDF document text
    • https://ka-base.no/images_content/file/52237020076.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c27041270f5---86036689363.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 4692 bytes
SHA-256: 6ab087606b975f1e5cad89c0bc282a9a3d657bb127f0d01d945cbb9501869900
font_01_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 11036 bytes
SHA-256: 22d5386cab70c73b5c4a7907adb4c3eabfd408d8a8bcee38044a2cff800085f3
font_02_sfnt_off00012d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D93 16272 bytes
SHA-256: 79a8b90f55ff6552f604b654de9415a285e7315ac61835edf8590ffdbde93965

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