Malicious PDF — malware analysis report

Static analysis result for SHA-256 647bd0a58896710c…

MALICIOUS

PDF

87.9 KB Created: 2021-08-15 01:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2d0b1b834200701c2246e4cc9b3d1faf SHA-1: a37c09fc1af3234abbcf6a97434a43addb0895b2 SHA-256: 647bd0a58896710ca9f1247a1d1d75012373ab534068cb15a739e9a8ae04e387
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites, suggesting an attempt to host or distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/dkvoj0vn6ia1sk6tp1nfo35mfa/15440173787.pdf In PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c888bc5571---xuwuwuwawajalazan.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d348c2218d---ginumewevodov.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0rpdm47lfu8tfodnuuodmt5cj2/95352342998.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/jowimaxitu.pdfIn PDF document text
    • http://runhouchem.com/upload/files/40654263316.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/45716001208.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/kuxafavoxux.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/depikor.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202107/file/1627281041.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/ripisobazaloze.pdfIn PDF document text
    • http://isvpro.com/custom/files/2736636383.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/fb9221cca9e9e9985374faba9846ba28/16416345096.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/ca8bfe3e3dbf97d350a6f53ae484c4f7/wogod.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbf3396ed8---20423141212.pdfIn PDF document text
    • https://limsurempat.com/contents//files/voxomezokevabodubozot.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/0ed98e0080bc5f33d9bb4508dff0da89/2824398600.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/72244944521.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b7ed5a37801e8f6dad28c862a8a25ac8/vofatupenobarefuwobele.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/84583145441.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/18g4fk8t3o3n4mfop1nl1u1fu7/nijarudovezi.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/goterumuduv.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/706757f44ea387d12ce11783a5207e9f/xewuvafezoveb.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/6334ba28f66d9c558fa17a5247e18638/fegikidujawadezupino.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/54516466836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=free+robux+app+apk+downloadPDF 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_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 17520 bytes
SHA-256: 3ffcc7d4fe62bc280239971bf29eab6bac73c016be0a912c71479a489feeca13
font_01_sfnt_off000121b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B7 10524 bytes
SHA-256: 3061c08f87c81755ebaff9867d6d4d105b9730ecc77b8f6a94b079d6148a3b58
font_02_sfnt_off00013993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1