Malicious PDF — malware analysis report

Static analysis result for SHA-256 f861639bb77b35ea…

MALICIOUS

PDF

85.5 KB Created: 2021-07-04 15:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c6cafd1d95014fd6a8364adf2b3ab5f SHA-1: 44fa9533aee51575daae784cfbb3c269f9d4abe1 SHA-256: f861639bb77b35ead8fb3900e63fb722f39cb6111ba393d979ce2aaaedabae05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=jeopardy+game+board+powerpoint+template
    • https://mttrasportisrl.it/dati/upload/file/52680146849.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/80ktvl8th0n907fm16dlgq584p/87336509441.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/bdr7odvg4eo3hobvgso37uc3q5/wetekukizasuxifizuvofiwav.pdf
    • https://loctra.net/userfiles/file/fijerigituzana.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f062697b9917953b5ed2841df2efaf19/xosubolaneliki.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/l4nqgklefohjfvj3l9cba4nsp3/jufidotemimewe.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/98568598344.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc38e5dd19---dorivusorazekadefafilaf.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef053a2ef2---tisixijuxifof.pdf
    • https://areicon.com/images/file/tusamilufazoga.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ibokpc39v0n1n613ccivl3dhsn/84775429639.pdf
    • http://tai-yang.tw/taiyang/upload/file/pulegevapuw.pdf
    • http://kibbkw.com/uploads/file/67430489735.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210602191552.pdf
    • http://perles-del-beya.com/userfiles/file/fuzum.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/de13e3mueupdk0rb22qhg0p786/dosuxafowama.pdf
    • http://intrinhgia.com/admin/webroot/upload/image/files/faxoju.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/tjfrhsfl837r3j95u3rrvd2nvu/gazakokebewekilubotam.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/16784e3181699249e94fdafc38ac9e37/64703113875.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/hbu6o8u9qifdmci7j0er1f6br5/76169496277.pdf
    • http://17njl.com/userfiles/files/kazapozesatufisolozif.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093cf2dead9b---16453918392.pdf
    • http://mikailang.net/userfiles/file/20210520093248_1536804135.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_off0000ec14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 16792 bytes
font_01_sfnt_off00010426.bin
fc8e453e56484dfb25e985a6916302562d32809a1b09c2091508ecbdf424557f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 16832 bytes
font_02_sfnt_off00012ff7.bin
3803cacf090e6dc19a23c66e329313210aa34735ae5d3968f9210ff7c61407c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF7 10900 bytes