Malicious PDF — malware analysis report

Static analysis result for SHA-256 3720900e8896f205…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 13:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80655c8527636fe5bcca0508979f9b11 SHA-1: cd4c06fa6d7d2b7a8fb37d529dacfec49cc11037 SHA-256: 3720900e8896f205a160abde942e4284c9df6c13cab7edd6428443dcff1d2302
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or credential harvesting campaign. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://laborke.ru/uplcv?utm_term=adobe+flash+player+for+androids+download
    • http://chemicalengineers.ie/images/bafivetugavel.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0f0cb3781---sisuvo.pdf
    • http://taiwangallant.com/uploads/files/202109300916191461.pdf
    • http://aldobini.it/userfiles/files/bisuxagunabajum.pdf
    • http://ct-tci.com/cttax/userfiles/files/99205443838.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4en0uaq63ahbpscgq1ttvg9m31/balowamuse.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/d4ruge8gfcldd4stmm2ib9ikm7/fiveripuxizagefujukezog.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/abcdfmhlsltniffvdgtpd6cu78/16880564422.pdf
    • https://autosaloncenter.com/uploads/file/43990277714.pdf
    • https://elnativocoffee.com/silver/upload/files/82356297977.pdf
    • http://svatba-emi.com/uploads/pages/files/61310552207.pdf
    • http://birkhoffhi.com/userfiles/files/14123394965.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/jaxevuvew.pdf
    • http://tndgdemo2.com/ckfinder/userfiles/files/23422763616.pdf
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/ginegixaliwanovara.pdf
    • http://canadianartistic.com/userfiles/file/98581096221.pdf
    • https://tasleemdubai.com/userfiles/files/78197901573.pdf
    • http://nature-revive.org/files/file/tamipoxugifikixivuxenav.pdf
    • http://on-video.com/movies/movie_data/file/48897502847.pdf
    • https://mangonebike.com/uploads/file/sabisab.pdf
    • http://fatimaartwork.com/userfiles/file/fubetetamuwofigodela.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149e731686c0---14595040790.pdf
    • http://blackhorsesc.pl/userfiles/file/67149290448.pdf
    • https://betenrealestate.com/sites/default/files/file/60122619517.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614710eb4ce5c---48057234707.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_off0000b142.bin
d6513a431a7e0226f862c5121f4dde565ef45e1942459e94d5eb63cdd311d179
pdf-font-stream PDF embedded font (sfnt) at offset 0xB142 16228 bytes
font_01_sfnt_off0000da8d.bin
102c80f99d0fc0b755e44a4b8044db816ff07e776affb0957160a195419b346a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 10820 bytes
font_02_sfnt_off0000f347.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 16792 bytes