Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9dba9a8e8980de1…

MALICIOUS

PDF

86.8 KB Created: 2021-06-29 00:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f93014d80db934612acee46138d3e48 SHA-1: 1faf13f03b2389e590d46ab7ac683c3b57d7eeb7 SHA-256: d9dba9a8e8980de106e610980a6b7d0213b9b7e3cc2e00017c5cb64be1340e6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs indicates an attempt to lure victims to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://philabc.ru/uplcv?utm_term=endgame+clanging+sound
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/436e6db979347d702c669edb618e1486/627915111.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160983c5a6664d---7412325148.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/jc5g03b3e7ah6m47l9sc818it4/jekafo.pdf
    • http://hoteldanang.vn/uploads/images/files/pelaxexifixujuduxila.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/pevilasawafak.pdf
    • http://liebherr-tr.com/userfiles/file/26682747242.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073337ef21e3---74764804120.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/90388f07a242d8949c38d44c6d62e30a/jotovu.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/3b97ba1355f31865e29eb05e63e643fb/60088990284.pdf
    • https://nusamulticentralestari.com/Uploads/userfiles/files/41505731623.pdf
    • http://deurenhanger.nl/userfiles/file/xomurilim.pdf
    • https://nabsangram.com/userfiles/file/91444201848.pdf
    • http://sochistandart.com/ckfinder/userfiles/files/mijejitiwuwa.pdf
    • https://vinacomvietnam.vn/uploads/news_file/kiwutuvasekofutagiw.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7644999e06---jaluxizeligivirupunop.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/7mbuol0cnoqusnmaiuiqc861p4/ganilovagemasijesixuridu.pdf
    • http://abnicum.com/files/file/gusox.pdf
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/pegugipagi.pdf
    • https://triangle-electronics.com/assets/userfiles/file/muvomakiwugatoki.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda563bc04---6073810691.pdf
    • http://teraval.cz/res/file/47286988267.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d666f02369f---41175992717.pdf
    • http://birnagarcollege.in/userfiles/file/zewedajodo.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_off0000ef66.bin
1110ecb5bd7c8ae68b646b31c8e49ca67b1fbcd40bcae77f859935c70c72c885
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 17340 bytes
font_01_sfnt_off00011c7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 16792 bytes
font_02_sfnt_off00013492.bin
56873d1585f7b82705156c7b8307c81881b88c27a7db8a34d60d609951e58f6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13492 10596 bytes