Malicious PDF — malware analysis report

Static analysis result for SHA-256 54573a8199ab670a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 07:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1087d1c7d23755b97999f6ef284e61e5 SHA-1: 967d3434c04c1cf67fca5316d1d478682d907620 SHA-256: 54573a8199ab670ada01ad6b55c406b6ebc3bc7d5d2c7f4119f5320bb0ce49fd
156 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. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://avanti.pl/userfiles/file/56338115508.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1624c299eb---kojamiguwijinevupuxi.pdf
    • https://smilepaper.tw/archive/upload/files/95335812127.pdf
    • http://prota.ru/upload/files/tofunokakikisukogij.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9dd9dcf51c9f427ffa8119325074863e/93248295394.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/dfc252b7a905a179803b1fa414e412ea/49801618872.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/bd5d1499950694f908bd4a9b98dd6733/19061713080.pdf
    • http://assushop.com/userfiles/assushop.com/file/wukimulum.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/zaxon.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161122e755392b---28625152678.pdf
    • http://ninda.vn/userfiles/files/dilotimexenufuzesexu.pdf
    • http://lixupeng.com/uploads/files/nevevumefidebetakezir.pdf
    • http://libron.pl/fckupload/assets/file/jamuduzedo.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/35ea7f5756ae7cc004b95859830cdb8f/93217317202.pdf
    • http://cbcom.fr/ressource/site-image/files/53923803042.pdf
    • https://marjoyunlar.com/calisma2/files/uploads/kokosi.pdf
    • http://analogsys.com/uploaded/file/1002500660dff01c1d4de.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b73d4a1a4---pibofejidupagufigazezax.pdf
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/90373571434.pdf
    • http://zrdb-drogbud.pl/Upload/file/65102193265.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6319c1996d05b50e95909760cbec50c3/xibaxifitavanatebo.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/c09f1b6a5ad9d29631c334ff936608c6/dutojuk.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/b50a42a45172ac05e7462dd88309d372/somomewelavizujuvafik.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68db245b8c---jedolasawaxajije.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/6847a3718b02217ccc364c0930fe8060/99562575929.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088527342fb7---barexof.pdf
    • https://habibitours.org/ckfinder/userfiles/files/25289915260.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609914aa650cd---polifuwegawemigasipir.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=type+of+learning+disability+pdf
    • 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_off0000de7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 16792 bytes
font_01_sfnt_off0000f691.bin
e5114779d96a13d4bb519b4ebced18a1faed1dc73eaf3f4fd5962b9d8520717c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 10892 bytes
font_02_sfnt_off00010f74.bin
2fe27b27863adb0d0c1449522ead6fecca8c37f11e1995229ce65bac13745904
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F74 17208 bytes