Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b44bb00a40922c…

MALICIOUS

PDF

77.6 KB Created: 2021-06-27 02:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e9be3225e787d278bce48717b7ce0ab SHA-1: 8cb4716795f9662c209e83b1707c3c307dc4c59f SHA-256: 24b44bb00a40922cb7b95d93c1d32ae1327dbf993d0fc75240575686238e0f08
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://eltonltd.ru/sites/default/files/uploads/lafixawukajivamij.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/815pt111pm7q27hdv0hrukek61/rokebuxarikudem.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a017b8f3fc---51738232813.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf2cb3bf19---6744545460.pdf
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/wuzatupiwe.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/zumiwubavoxilavunubaka.pdf
    • http://al-bandak.com/userfiles/file/67892850955.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087f66d90da2---60770656953.pdf
    • https://styliststudios.com/imagesTE/file/sorewoxuwebu.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ubgfg1tk1puk1m8efbmu6thu6m/kamutegajororofive.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c2d36918c---49078946357.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084e9e667ad6---robefoxewaxoreliwojesax.pdf
    • https://saatyapi.com/upload/ckfinder/files/28097754515.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/3doi9fdrq0d5h6ofk3lkpu65sp/33274404676.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608db29e34fed---5944939008.pdf
    • http://loadcell.vn/Images_upload/files/sipudaloz.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a23223399f0---86437153405.pdf
    • http://banquat.com/userfiles/files/83332439773.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/63f1a54163ee0b2a9b44ea1cbb9b0ceb/potabekadefubuxuzurifiw.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/db649ec28f0e36f55ab08fc99eb0d046/depijoziwejedujak.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/benarogesep.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=convert+dxf+file+to+dwg
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd90.bin
6398c70d7d1d3b322ba5912fc64720b7b91954614bacaf2e4f0a74d94f83e5ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD90 10484 bytes
font_01_sfnt_off0000e55d.bin
a37f00b4bb194d96d054d960103e9a7252c918d8dbd4bdd9503b960becc90de3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 17048 bytes
font_02_sfnt_off00011177.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11177 16792 bytes