Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df75679685e97db…

MALICIOUS

PDF

87.5 KB Created: 2021-09-21 22:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 184d69d7f3c137d52210355158d0a0bc SHA-1: 3dda8718c1ec82aa5199cce03b0b8087b492fa40 SHA-256: 5df75679685e97db4c9a0202dead7980fc64af7dba6091f7c73766c03ac8a584
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which appear to be disposable or compromised, suggesting a link farm designed to distribute malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. The embedded URLs, such as 'infrive.ru', are used in a context that suggests a lure for downloading potentially unwanted or malicious software, disguised as a game download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=download+game+friday+night+funkin+apk PDF link annotation
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210918202122.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/49992798440.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/88429739502.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/97390852053.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/kemosas.pdfIn PDF document text
    • http://renknh.com/ckupload/files/visewaxipixidunazurupiza.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/56202989710.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/zixesoj.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/28142379844.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/21971324666.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1c2957739---luvusus.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/326311425fb1f107e6d99c024e1a45d2/6099323482.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ctg7l3sf1qeoon6secuhheaadt/87451807187.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/matinizanim.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396476d433c---3157273328.pdfIn PDF document text
    • https://mediaskills.rs/files/13012872584.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/52757536135.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/kudifudalamulaxumusari.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/banevuvefen.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/24194498817.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6cc30a77b---37244724395.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/c7devm807s0p8sc2uaog3mv45j/nunexasek.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/momajejenolagugobimojatil.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/kobugi.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210917/16318777395649.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_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001075d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 11168 bytes
SHA-256: 7dd6bfca010c3536aeb5e56c143772fbc237e9bdd24934fef4a7e777a5bec602
font_02_sfnt_off00012117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12117 17824 bytes
SHA-256: 94e95f1f2d09c36016c765bccbbcd130164136788bbeaa432b7d0a89392235fe

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