Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c3e3a7643aa8e0…

MALICIOUS

PDF

87.7 KB Created: 2021-06-29 00:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e101946a027bf71a38154f916b30986 SHA-1: 950c5b2a41429634f7b4b176e92f004d8bab0a97 SHA-256: 22c3e3a7643aa8e087a1f4243065bba30f15b7e75fa0d90e6eba21be12c0e21e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://catamma.ru/uplcv?utm_term=oldest+banyan+tree+in+the+world
    • http://goodwill.as/userfiles/file/zinaroruwug.pdf
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/xiviterenipujug.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e608f4dc49---paluvefizoselupugito.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c0d0186453f77a3d6cbfadd5c6aca150/xevoxasewufikanifedume.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607564a00918a---20185684389.pdf
    • http://www.specemc.ru/upload/files/27207027041.pdf
    • https://luyenthitoeic.info/userfiles/file/87053138334.pdf
    • https://travelsafeway.com/userfiles/file/fubitivuzezuj.pdf
    • http://kartywspomnien.pl/uploads/assets/file/laxobupigizuzewaxama.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/002d900d84d31adecc8e70d6dff2cfb0/88525798126.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ee177b185fefd13358785f5027c43d41/kulufilawilimivebogowi.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609484f3db748---japipapopakofu.pdf
    • https://mecaniquekd.ca/upload/file/19265045101.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160da39e185eef---12545392537.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/31533717021.pdf
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/zotunemeru.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9a77a35e6f03bda3686fdceb93a5312b/51020745633.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/jeserukukonevazez.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b111da81b1---vekikikesidosonamogibafa.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/0fjthk0buujlgc1lo9qgr772a7/gininofosob.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160af9cf179849---lonunubaganodebifa.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c152c29bf8---darederuger.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/5f058ac5656474cd2de305e57043de47/gapemegizedamumesetak.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dfab9544f---vaxovejus.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78056150a0---gevewomikikapaf.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/bp3u9j011upqm4p3hl58uq520o/86882061552.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_off0000f01f.bin
73bdf9e9839fd238efdd815be2258ac91778987c8282baa259e13ea3f1be84b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 18432 bytes
font_01_sfnt_off00012092.bin
944ad4378993aebe6fb17e29b9c91193900aca99bc16ea0d9e87c92e3a6b4b32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12092 10708 bytes
font_02_sfnt_off00013930.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13930 16792 bytes

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