Malicious PDF — malware analysis report

Static analysis result for SHA-256 9649525138bbd433…

MALICIOUS

PDF

86.8 KB Created: 2021-07-02 05:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7c2488ba2a1c05bc58a3d6fdfd3bcb0 SHA-1: a8f74118def9f1327a917e5cbf457580084f436d SHA-256: 9649525138bbd4330d7aa1c59d51804e7cedb83038cec21daa331cad353ac9b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple links on disposable or compromised hosting suggests an attempt to evade detection and distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b31cb35b5d7---puvodiratime.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080a0ce2645d---mupojofiwifosu.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608204922e7f1---66350387883.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee7a58049---7540640437.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f35920a3f---17484525372.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0080e80c8---11869245661.pdf
    • https://agermag.ro/mm/file/92076385477.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a87c9f00da---55841369011.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f1668213---bumebo.pdf
    • http://videofilm-tv.ru/content/File/masafosolotakonobud.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/a3b92d8db2cadjvglign4q2bfv/debutezapuja.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084057e6ce30---zamazusulasutakulixa.pdf
    • https://studiovizia.com/webroot/img/content/files/1671624277.pdf
    • https://agermag.ro/mm/file/27024910563.pdf
    • http://sgrappresentanze.eu/userfiles/files/20227502618.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ef179a2faf626212caaf3a0c2eb8b952/15176154217.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5093d8c6e---75543421259.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0044dd031d88ff20d0beec0fb7230244/50572946601.pdf
    • https://qpshouse.com/upload/image/file/miwifikubozemakesofizig.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608538684de7f---biribosefebedinamuzire.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/aa129635de1a4637e3feeebce062e449/7624609396.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a476bb34f9---15319847287.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=rational+and+irrational+practice+worksheets
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000ecc2.bin
31fb0b2007aebf51cfa0ba5234b930a8597a23e6d3b5914f1853f21bf2bb5108		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xECC2 17944 bytes
font_00_sfnt_off0000d3c0.bin
86b368e4734bf8ff192a907fd71d95d4b2289cf0435e9bcc893623d7ad626829		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C0 10836 bytes
font_02_sfnt_off00010853.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 16792 bytes
font_03_sfnt_off00012065.bin
ca45c8e1824a886ccf29ebde3ce5098da5f82c071861ec6d7c4a466bed0119b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12065 17232 bytes

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