Malicious PDF — malware analysis report

Static analysis result for SHA-256 81375bc7c17158cd…

MALICIOUS

PDF

84.8 KB Created: 2021-09-23 07:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa3ca2bfb0fa2a09e7ab1cbef3ac1b59 SHA-1: aac0ebe95f3a8c0c9f454891e762b264a7b3d1c5 SHA-256: 81375bc7c17158cd5e45f31100af15d2b5ffc4e38678eeb7fd9389168e6cd86d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of a raw IP address in one of the URIs and the ML classifier's high confidence score further support its malicious nature. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ammk.sk/userfiles/file/31478251993.pdf In PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/59260290557.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/47773460221.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/21807819220.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/wegive.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/bubun.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb7c53bc1e---17218955581.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fea8d8d1e---demomimusafojimizetofojo.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/19375980168.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/mamuwuxidumegugem.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/21329891655.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/wivugumoximesawimuz.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210922_003524_188.pdfIn PDF document text
    • http://steinemann-ag.ru/faruviviretefiliduluv.pdfIn PDF document text
    • http://ossokahve.com/upload/file/wejoreguporesozeluwedu.pdfIn PDF document text
    • http://djpress.pl/Image/files/keresiw.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/vekuraduv.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16143df855db6f---82079807414.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/tuwolikajax.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/16961767419.pdfIn PDF document text
    • http://minhanh.com/files/92884564678.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/64396311315.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/tiluboninosefof.pdfPDF link annotation
    • https://path.mn/userfiles/files/94664452716.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/34564205163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=watch+tennis+stream+freePDF link annotation
    • 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_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 10428 bytes
SHA-256: 593b3be839998230d646961bd529faaffb386fa67308fd0d3db9dbda6908ef16
font_01_sfnt_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 18304 bytes
SHA-256: 4fffbe2f0d46eb339857d05180f7b856e260fdecd8af9a9cea5b5671254e1299
font_02_sfnt_off00012d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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