Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0dec77c2ee3364…

MALICIOUS

PDF

84.2 KB Created: 2021-08-24 23:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50683cc7edf0a119266a42869d751f08 SHA-1: a906d76ed2d636b164e3c27cf0043b29b2332792 SHA-256: ab0dec77c2ee336420d555e2881bb918965340f7fa3dc3541e75e7ca7e8e647b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is designed to hide its true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://rajatotogroup1.com/contents//files/17335722110.pdf
    • http://edu-family72.ru/content/images/uploads/file/49837829034.pdf
    • http://stevis.cz/files/file/medujekazasifimuvamutaz.pdf
    • https://gs-hemeringen.de/ablage/userfiles/files/zatebobep.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce4445fabc---15564672276.pdf
    • http://cocoal.com/uploads/file/wujelodenubabiwerapufu.pdf
    • http://design-klasse.de/ckfinder/userfiles/files/pevokotijon.pdf
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/81232488314.pdf
    • http://absolutelyneon.com/userfiles/file/7052355543.pdf
    • http://fvv-hohenfelde.de/sites/default/files/files/33485204981.pdf
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/siwugigofedaniw.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/50732967924.pdf
    • http://www.520amis.com/upload/files/91492116049.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/sgekpbi992p0ko8prgpfthdvl6/gatak.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607a960607135---5653337655.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/cc0899deb4e30afcee2e31edda6bf7e8/wedugiludoxopumeronejediv.pdf
    • https://stdtekstil.com/upload/ckfinder/files/13633294305.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b612a3c2569ad397f0602e413a8a3f53/49727133062.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc891aac0ec---xexibutibipifu.pdf
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/18777777447.pdf
    • http://ventensis.lt/public/ckfinder/userfiles/files/91469051299.pdf
    • http://esejsc.com/upload/files/88186925384.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/jenikefonibogo.pdf
    • http://cuuhoatudong.com/upload/files/gakokedurugunelivaf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=another+word+for+confused+feelings
    • 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_off0000e4c9.bin
353f367b451c5935396dba5b6c49dd502fecaa5efe4fa939144963d282d8a46e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 10760 bytes
font_01_sfnt_off0000fd56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 16792 bytes
font_02_sfnt_off00011568.bin
8b14086bb04770f9a42d4bfa6ce182fd5f93f4c615e0f22a72320aae57c7d120
pdf-font-stream PDF embedded font (sfnt) at offset 0x11568 17268 bytes