Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd53f1bab7115109…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 07:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5965e95ec883d5a8e040e1e3605a16fb SHA-1: a78d0e2b739abab4182c5c16cf924202bfa68460 SHA-256: bd53f1bab71151095f5aab2b87b15b97cfcac64a388902fd2b2858851f866a25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous disposable domains, many of which are hosted on compromised WordPress sites. The primary URL identified, 'https://krisoc.ru/uplcv?utm_term=metropcs+apn+settings', suggests a phishing lure related to MetroPCS APN settings, likely intended to trick users into downloading further malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=metropcs+apn+settings PDF link annotation
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba2b8e6de---31152417960.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/nvc0k15abkv5o938pnglbi53oe/vuwijipufodewiwi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05a4ab3f6---mipofafixu.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/vusumilewovugel.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/labenaga.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/38050815489.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/digitetulajalerov.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/16939404557.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/60000914135.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bbbe17b3---xitimadagira.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-8/20210908062524201708.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/kenonilimen.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/11916492481.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f219fd106ae907f706043146a7553fb9/27326604404.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/zomedajobokuxuwonopeda.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/43056579044.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/tususapuvuzafitinirob.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/xolinoxorijelawegusurale.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/7388278405.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/51624699938.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/53294233843.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_off0000e2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A8 10496 bytes
SHA-256: ae977624fe3a2434c2e9072af11eaab984f18e6c012921365ba56515bc828a91
font_01_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C6 18392 bytes
SHA-256: 8a685f16e029c17c6dfc80081df242610a77d4037335211db19b8332ccc694a6