Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afd7b21964dbee8…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 01:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b7d978fd2d5c4971bbb82677a2b7637 SHA-1: 35c7e2cfd2f4443f22e7396f5d6df3a64d90730d SHA-256: 9afd7b21964dbee89db66756fac804c9d24fde8345cc0c7a691502dde79a6491
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate maliciousness. It contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of multiple external URIs and the overall structure indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • 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://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53228190927.pdf
    • https://funstore.dialog.org/userfiles/file/7479310395.pdf
    • https://lazeo.nl/userfiles/file/satikulogukumavu.pdf
    • http://orderkiwicafe.com/uploads/files/riwubatuxokisesakesexudi.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/75b4e1697dd303c53790750a298f1976/25048775672.pdf
    • https://ceccarbotosani.ro/userfiles/file/87761888640.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/21785058737.pdf
    • http://jarauwerdaenzn.nl/userfiles/file/nobefagana.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/bb4064313ac16c0d4f03b86037fa1a09/42004183020.pdf
    • http://thunderstar.cn/userfiles/file/20210911012134591992021.pdf
    • http://hanhthien.net/uploads/file/zoboled.pdf
    • http://togclick.com/media/userFckfiles/file/70803305642.pdf
    • http://kamennykoberec.eu/editor_uploads/system/files/17744390758.pdf
    • https://hurghadalife.net/userfiles/files/42659005287.pdf
    • http://signauction.net/userfiles/file/nilokadurubopiwof.pdf
    • http://kursadowicz.pl/Upload/file/10205780965.pdf
    • http://i-akparat.kz/ckfinder/userfiles/files/99411799489.pdf
    • http://artetendasud.it/userfiles/files/notajotufusijijurusixusal.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/f87d63869ca4f4148b42f630a4c61b0d/tojaz.pdf
    • http://cafegreenwichvillage.com/uploads/files/munavav.pdf
    • https://glycocalyx.nl/userfiles/image/file/zulirapivivajesanukuji.pdf
    • http://stluciachamber.org/uploadedImages/contentImg/file/4536532470.pdf
    • http://gatewayhotelbangkok.com/upfile_hotel/files/nutujox.pdf
    • https://barcelona-health.com/files/galeria/files/fopeposukeped.pdf
    • http://4bx.pl/public/file/zaturoleda.pdf
    • https://szelvedojavitasmiskolc.hu/files/files/58398989362.pdf
    • http://ahkjt.com/upfile/file/tevodit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=monash+clayton+imaging
    • 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_off0000b465.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB465 16792 bytes
font_01_sfnt_off0000cc7c.bin
b9decf2b473c409ed8d75cf88dbf3ff6c02562ace36ec695b7ccee6dadea0a92
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7C 10552 bytes
font_02_sfnt_off0000e464.bin
e47cfcea3fbf7ce4eef6fc0e53c3a369e24d6fb89035e52308addd0a13cb5513
pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 17212 bytes