Malicious PDF — malware analysis report

Static analysis result for SHA-256 8554dd6eb45257f6…

MALICIOUS

PDF

77.0 KB Created: 2021-06-27 00:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82b8da135303c42290b2942d6a579cfe SHA-1: 1387583b8852d745f26ff3b6637aaad6f4fc1470 SHA-256: 8554dd6eb45257f684081f1fb91b3fa1e9f96859736cff3f3092f86d08e3e714
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816677960ab---83020247456.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/memafem.pdf
    • http://sea-cruise.ru/ckfinder/userfiles/files/gavosofel.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097a4c445da5---98408825336.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608156d8e9a34---62334519851.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/11bqdda7tabhcut26243gkfoud/68316338037.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/bedemaxubipijikosofe.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa754a90140---74542578959.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c73e7b47ada---60863657179.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2r4ge69uavujpi6jmudu671es3/55303086797.pdf
    • http://jfk1969nola.com/clients/873000/File/tuwaxobavixevunas.pdf
    • https://contabil-fiscal.ro/mm/file/zemezekimodozipo.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4000bd5afb---1555920867.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab145a4fa36---galogozu.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aab6f7d60ae---69188021062.pdf
    • http://sotel-perm.ru/site/file/zelog.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/8aff5986a8593602b7b41e1f31aeea5f/suzuxubilisaberananurumir.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/fn2iunfpoa6dqvv2a0plt1f20j/45959168102.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799bd12c6ac---49910844122.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a401c65a83f---3669873180.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d643903e0---86300894324.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b711ddd308f---74700457051.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091021a12384---22965245579.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=find+the+indicated+term+of+the+binomial+expansion+calculator
    • 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_off0000c2f8.bin
18ae38d28f1d5ee2b554c0fc44b0dd3676b6cb2c285630a95a2e3f1fd7e87d50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F8 18448 bytes
font_01_sfnt_off0000f476.bin
773b97a656d729c6342476d0507459242544ac0103ccf627967fa30d3decdb3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 11204 bytes
font_02_sfnt_off00010e39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E39 16792 bytes

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