Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad87116452c3aa5…

MALICIOUS

PDF

97.1 KB Created: 2021-08-01 07:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b71d0642d5a338e2ab1c98db7b796209 SHA-1: e3a6c736d93dd7136d38c340cb641dd5a85e409b SHA-256: cad87116452c3aa515d1753cc71bc5c464af7ad4ead82e5db557b95b3f7e6c48
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9673

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 http://thebranchoflife.org/clients/3/37/37a84c4c47f147f839b5d5a44bb1b86c/File/9576822736.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ogkoqru9bk0pjdiv1d73hmqqan/tubopasikixenuw.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c879c9eb1f5---kajaroravivedowisitosoliv.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/39781ab1e94bfce82f4cb9a7d4feb7a6/dotax.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/add6426fd50f6920bc21740989a26f43/22934581117.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f12ce0c598a---44102391304.pdf
    • http://mebell-city.ru/ckfinder/userfiles/files/vajubujejenabo.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b0820ea12c54e2805ec37ba6caafbbbb/rolujaposepusowuk.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ke73dhjk22gnk7q1rjqaiigv8t/sabaserug.pdf
    • https://rosenstein.lu/userfiles/files/vasevazunobotozotekinezu.pdf
    • http://mwflower.com/upimagesfile///69661687979.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4fe224e96643d8bb8d290b825790a220/gefaduzarubasitasigajob.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b0de07c6f33---doresimusifasawon.pdf
    • http://solee56.com/ckfinder/userfiles/files/91510230537.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cf3a8b6e6---dudaruxubinexanidazu.pdf
    • https://horacebatten.com/ckfinder/userfiles/files/sazob.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/oqbblvib1ps278h78i3bqq7kdr/gezafit.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e93e4587efa0e39b276c79648cce5632/miwigakaf.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/3fc5fu4eqpqlu5a00kral72l88/8404511110.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160aba515df7a3---kitumoxudapomufibepeluxe.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afd155748f2---neder.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a6968f187---jifinerisugakebozaduz.pdf
    • http://quaretti.it/userfiles/files/62448425678.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804dbf5926b---70330839094.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e22e6a65f8---wefefinugutina.pdf
    • http://www.vikingmaterials.com/img/medalifunirewotaka.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=retro+bowl+unlimited+coins+apk
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/c6eab9efc62bdf2b6127ef5551b473f4/pajapumisabete.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff08.bin
dfa68df3a17be0be77cb10a3349dc56427ed9b0e8fbb93c740c2aed9244ee926		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 11140 bytes
font_01_sfnt_off000118d7.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118D7 16140 bytes
font_02_sfnt_off00012e4f.bin
1a73880abb5b192dfb2161c8d45bf9e37e766afc374df15771e9225aa7462af2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4F 17472 bytes
font_03_sfnt_off00015c78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C78 16792 bytes

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