Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad94431682af6c8b…

MALICIOUS

PDF

86.3 KB Created: 2021-09-03 17:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 802228738a86f07680782467e6590058 SHA-1: 847b9532d222ab299aaa5c149c2fed1c3a248b3c SHA-256: ad94431682af6c8b3def480126d971a62dd84d3d6d1874332a6d4940e49b5a79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript suggests potential for further malicious actions, such as downloading additional payloads or exploiting browser vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/428302de966aaf1fabd2bc70be334903/7343857141.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d145303925---ralopoxerut.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/6e482ebgl5kcd5gndiahvlbtv3/vubikazodose.pdf
    • https://cbconsulting112.ca/userfiles/files/74360183936.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/1cc1c809a4707c1bfcc5497f1b45e08b/kuwil.pdf
    • https://al-farh-iq.com/upload/userfiles/file/zevabasololetaf.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/6b7fc2a1608d6025a54ad1de7fd2de1d/dotanibusudifi.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/6lubuplpjq6hmco8to2kr70cll/sigoraleneted.pdf
    • http://alexlunacoach.com/img/editor/file/67416368034.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75ffctmnda9o2jalkk6t4ifi66/lupekavobewux.pdf
    • http://dpsszczytno.pl/photo/file/40710251614.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/nizifovegonuzizok.pdf
    • http://aarogyamedico.com/userfiles/file/55922713943.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/d8ur2sm6nrsde6sgo6e4mpfkug/ganewa.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160943aacb913f---66433319675.pdf
    • http://retroldn.com/userfiles/file/lufixogo.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/q954s3b1k13utkgbg78dpl6raa/33429178887.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3lmnsn174a4p2bcd9hltcp743e/wobulowudube.pdf
    • http://rauvuonsach.com/images/uploads/files/54658103173.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfcd0efd62---zikafiteduwafazemipuzo.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5256db9fe8---74311250091.pdf
    • http://swaminarayangm.org/userfiles/file/23967683556.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=allen+maths+formula+book+pdf
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/tetixanujufixamoripox.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_off0000ec97.bin
f865a681a75c04c9d6112b0661a06fce0537613339041a8cdc548dc5b5ec9b3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC97 17640 bytes
font_01_sfnt_off00011a5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 16792 bytes
font_02_sfnt_off00013276.bin
1d443d232b3159b129b85d9c6f8ec940b8191434e5f945cf327c143213ecf7a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13276 10984 bytes