Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a3e185d304537b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 07:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86baa64b28e1859c2221ff7fae5d8926 SHA-1: 7da355ff6f73f5348d18e5c14c7983878c17b10f SHA-256: 04a3e185d304537b97b336f3cec1f7ae98b8f0a444aa83cb3e07f0a10d2d1697
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of link farms on disposable hosting. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The primary function appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://garglob.ru/uplcv?utm_term=css+hover+animation PDF link annotation
    • http://parkhigh65.com/clients/4970/File/gebivatuzuk.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/rasevovexoz.pdfIn PDF document text
    • http://falerisztika.hu/tmp/7642822857.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/98088016816.pdfIn PDF document text
    • http://dsagco.com/Upload/file/51266286675.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/6b28c7f128e371935741feb08d77d873/xobop.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/nizapaporagozum.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gobilavido.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/77925077781.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/dulutukazenumurat.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/6f7e3180ab6ea1199f12413f6792823b/18552725569.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/vnhd0lsic17eoidjn54us0nncb/1160663344.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebad060043---botuwitazi.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/16324817539.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/detotig.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/9428419125.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/91269231608.pdfIn PDF document text
    • http://rapet.hu/files/kusosejesuzafe.pdfIn PDF document text
    • http://saltyfeelings.com/userfiles/file/tobogodizogebuviludelexiv.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5079ff9ec59908e8041b5895af1be53a/xapopagiven.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 17648 bytes
SHA-256: 4a9a4b85fade767b3a074d54f9c57b55917ef47b6a5d9dfb85b20fdc171da770
font_01_sfnt_off00011222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A39 10424 bytes
SHA-256: 0bc322f6950660110780f273e91c9e99c8a3a13f7f3c17ce01945fdbdcb5e778