Malicious PDF — malware analysis report

Static analysis result for SHA-256 510acac0ca0b0a3d…

MALICIOUS

PDF

89.7 KB Created: 2021-07-31 01:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 756353c875a9fc1ab66641df8a18bf61 SHA-1: be9f5ca4ff53e981bc8c7f47cd81305f8054ecc8 SHA-256: 510acac0ca0b0a3d457fe21152512cd445940b75fecda5d7573d849707e075b6
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to host and distribute further malicious content. The presence of a visual download button lure further supports the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4c87540e2---29515828948.pdf In PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/7759abc4ebd4df176334557327d36678/43985912493.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eca386814c---66556518461.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099c3ea6ed08---71599113775.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a479cbb20---88432103009.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/18218905702.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/cgqt21d8jobssi1nfmddvabmb4/47638764715.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/jezunimopepiziz.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38312b36afb3917788295c96417c1f87/fikoxusevaximemosuzuniz.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/xugevepixap.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/jizogotudowizokilujiwiruj.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/zuwusena.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/vikubenelavalulijaturi.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/aad159df2b5f36b625c34870a653d05d/60538453838.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/pvmho7h3b39p9ttqao2ekkojeb/kinarijamimokiwifofe.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4359cbc04---powotavuxutesivoxupixab.pdfIn PDF document text
    • http://cuiquji.net/d/files/43532249660.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/808bbfd6623dfaafce2658b3526f83c6/vakexisirekoneduzapuxe.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/kazoxubanijiga.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/0f2008ee03d2411d903a74a1ec2f054d/lutezagatudef.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/73d24d35830a1a8040ef56d25ddc38fb/risurowuriwetipe.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/fisakezid.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/41472976611.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gqb6es9nh0utmqhl218th0umb3/70973673348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+know+the+tone+of+a+poemPDF 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_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 10388 bytes
SHA-256: e354dc1ff2ea7e95bb4f92bf8b38383f58e510d43fba25e5033f9114f87c1666
font_01_sfnt_off000113f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C03 17192 bytes
SHA-256: 7eb1e9940d907ab00b762e2183eaa74a3676a46731c4216fef6db36a1680f8d7