Malicious PDF — malware analysis report

Static analysis result for SHA-256 492b1a25d1b346e1…

MALICIOUS

PDF

100.6 KB Created: 2021-07-04 17:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c97fffb6bc31a2a0975f2c934e217371 SHA-1: d0104a266a5fd8334109409aa916c1786b7bac3b SHA-256: 492b1a25d1b346e132266d3b7f8b18dcea4834f463001e4e06eb8c9d0cb86c11
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious or compromised websites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or the distribution of further malware. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9bf8ef73f---55464466874.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090735051885---loxunalakuso.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875a95f3750---16344461349.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4af605b671db5d6d5ee2e333f5d252a0/fibex.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/38735885176.pdf
    • https://agrilaui.com/userfiles/file/bonogavafatodo.pdf
    • http://mimarkamilozkartal.com/userfiles/files/kuvubolatuvezelipedoze.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/pj62fgbt01422tsidnjnm31iu5/69294892874.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/urso0r832vionkkaag3jetgl22/79923878116.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/hh33a4hn53mgbgnns8h5eum4fh/93835057017.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a082de3a0---33924672985.pdf
    • https://pasarant0g3l-turbo-h1t.com/contents//files/xefikodusa.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/6d9cd425974d06580c2b4cf9c8cf24c7/58956173051.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607339de2807a---64415630452.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608337718e685---bukanupawul.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da597e941fb87d72cb8d0c05a5b2ff7d/wojiserenadakupatumotob.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ee151c868---gudatapamu.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/ef5ec7e9826fe93af107cecbe5e65bb5/vofomu.pdf
    • http://architects-desk.com/uploadsfile/rusomemalobiwekivaj.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16073fcbd77557---rupolunexejesu.pdf
    • https://caribemed.com/userfiles/file/88885153045.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0a60dcfd---fifavemufadafiminonagu.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160acf5c418f28---34657721861.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a2075a75f---38237768340.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/wisemujosazabureg.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=tralee+county+kerry
    • 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_off000122c4.bin
0a9364b68fbbc3d5dfee7e36887692603139c4da6cc4e2aebe29d058f5b6c2b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122C4 10232 bytes
font_01_sfnt_off000139f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139F3 16792 bytes
font_02_sfnt_off00015205.bin
a7b0f0efd360862623c8707712438837785e0fda14f905e1900f4095e8a1560a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15205 19180 bytes

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