Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc369788d90b5d2…

MALICIOUS

PDF

97.0 KB Created: 2021-08-19 19:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a0ad9274fb2271c5842d1ed52fe3646 SHA-1: 1ba297f110854a6c0803c637fea869716b5e0a68 SHA-256: 0cc369788d90b5d2a13e11ad6b902eabc6afa401b04d2587abd5ffb4bb511992
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with critical and high severity heuristics firing. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or execution of further malicious content, and the link farm serves to obscure the ultimate destination, a common tactic in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://studiomontironi.eu/userfiles/files/6928816594.pdf In PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8f6d1bf85---vukosiviwot.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/51371319593.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/furesazo.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/67102910672.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/mitujanobonefojoraliz.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/kazedefenajobanofafubupo.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/2562756870.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/88081559859.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcd41025f1---77922517767.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/q7lc81d1ejat80vr7q98eod79r/labegupazanaxopuf.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/19164581835.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/29473378944.pdfIn PDF document text
    • http://sooclose.eu/upload/File/68698864094.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff2b64396b---pubokazop.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/79019133948.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160817e2f72b2b---luxazixesiguf.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/fead3704676fc0ed018ed9fc19ccbc1c/63436320552.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/143f2d997209732d03c793a0e43b0731/94179555848.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823b82dca06---25300592296.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16084fef053da1---20973750479.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a792ad460---38346621276.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ispap6o3ji1fpjjfip26ipqlf2/20986901966.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210628025839.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/74f91f19de7f25824f58877f2ceacf3d/61590570403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=entradas+final+de+copa+del+rey+2020+futbolPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 11192 bytes
SHA-256: 2b07c95074456497135ebc8bfb2eecbb2a582fed1b14b6e819b6e7c1a59f1920
font_01_sfnt_off00011391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11391 16564 bytes
SHA-256: 8cb843d99cddea25fbbc975c02a3b954a598f39c530a1763c6da8a021937eac4
font_02_sfnt_off00012ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000142d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D5 18988 bytes
SHA-256: e444ac66a1acf14899021bfc89d4e8e0169832f9502b06fbe7d54e70e4e3d3af

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