Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c61772bcbea09d…

MALICIOUS

PDF

71.8 KB Created: 2021-08-28 02:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 462db249ac35f6321ec3376241959653 SHA-1: d2c3bee0385542eb369cfa3974cb294e2c7f1232 SHA-256: d9c61772bcbea09dfbeb3f70e54bbdd4214356aca25c3cae4bd79d9e2e6703d6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of hosting numerous links on potentially compromised or low-reputation domains. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://secretlove.ch/ckfinder/userfiles/files/16827627974.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/vbrb8k648ikkvfu548n5vc6qpu/57949836377.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/5c927df7b68d47b0dafdbc93fd8ac8a2/93117593023.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aac1f48936d---5820194627.pdf
    • http://aostavet.it/userfiles/files/43244715085.pdf
    • http://mesahighclassof64.com/clients/874441/File/14617901053.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160775bde34f4e---xumorufegur.pdf
    • http://bavlas.lt/ckfinder/userfiles/files/zofutak.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/g2d93foomtsuk1lvd7n17a08c2/70053695813.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f09bc67425---5891071718.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e5b2a089edc5750dd410f01e99953ab3/tetasunuzonuxuwut.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/30908525828.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16077528ebb814---ginimuwananalapozuvilug.pdf
    • http://flairpens.ru/uploads/files/93806449485.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cfd697ae7f---femex.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/64828141448.pdf
    • http://madiagranitosilano.it/userfiles/files/kezis.pdf
    • http://driver-jazda.pl/upload/file/tinoru.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/62305e27eab8da3d79c174936cc0e5da/14809045282.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5df5393c9ecb5421dc28edb1abf58485/68360689908.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8b0662c1---47106800708.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732c531caa2---37007474378.pdf
    • http://stark-tools.ru/images/uploaded/30164454564.pdf
    • https://jagamimpi.org/contents//files/wadagujivar.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dark+souls+3+ring+of+favour
    • 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_off0000b7f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F7 16792 bytes
font_01_sfnt_off0000d00e.bin
dce8b41475c81f3eb04c9db30322c2c402f193f058e63e6689abb73669a39e5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD00E 10592 bytes
font_02_sfnt_off0000e860.bin
3e23c5d07b6bc8523a006ba2845486554f1a8d1fde8f2afca2491e0f4e24378e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 15788 bytes