Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4328dd0ae1edbb4…

MALICIOUS

PDF

82.0 KB Created: 2021-06-25 15:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7042a7b571900e4fa41ae0dd09553f51 SHA-1: df57cd56b292770f8a78d41895a26185ca797d14 SHA-256: b4328dd0ae1edbb40de65ef617122bb98ee021517a7aa25102d9ff3b2217ef31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable hosting. This pattern is commonly used to distribute phishing content or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://office-agglo-larochelle.fr/userfiles/file/8183374545.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/cbd23c90fbefbef373ade4b6eee3681f/femizelofi.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d422f73f907529fb3c8cbf13ab774f01/97674154823.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/m1o87gm9t6urn0mtpaaoss5ms0/63797680541.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e18f1b9461---61689737669.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/jgtamldi99ri2oitjafqhnjv94/fadutulatoz.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8361902b1---gujirotovapuzar.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a83644bd82---momipipajumosozanoferuze.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/caac2333edafe4fd8666b571c26412ba/topizaxopozul.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0bbfc77ab04b1810529c00ebd3132412/xupew.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/23d98782e5785520272afd636e867247/benaladedoduvalidotirubep.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/9c7b5t3ofvr7dr44k56n194kp1/fuwiwejozopunu.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/be8a7bfa24e98cdb19a740a7f71c2ec3/79236758204.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a940b8ead4b---ledokonaxalenulodolemof.pdf
    • https://aimhc.com/userfiles/file/gemepoguvigafovopasa.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b801dae8d3e---60715826674.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=question+answer+science+class+9
    • 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_off0000de47.bin
b888175fbc3b094d49bdf99b0d68f11317e7f581d4bd4b4818a6af00720b8c67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 10636 bytes
font_01_sfnt_off0000f6f9.bin
11c2399b087294fb0b8770c378b08f1b8dbc3f778443386c358d0a89f43b3acf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 16964 bytes
font_02_sfnt_off0001231e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 16792 bytes

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