Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c71055db5fd04a9…

MALICIOUS

PDF

93.6 KB Created: 2021-06-27 08:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45113b009655ac2c6ec1d8f7b802e110 SHA-1: 3ad79bc7830c0eabb85871e838ca071b89e984f7 SHA-256: 8c71055db5fd04a9ac8e61e371d4b5a19d93d7833604b07baf34f9965dbba760
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple links on compromised CMS upload directories points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cowichanseniors.ca/userfiles/file/sesobuwuniwute.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/ad775a922da752d8ee20d0844adde38b/zojokakuwamofelunaju.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4767bbeb7---detowegemeposoji.pdf
    • http://patp1ryb.ru/media/file/70605413915.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/240ce9aa6bc70302356ac665b4ae9bff/95427246521.pdf
    • http://ahcxdq.com/uploads/file/032050575838.pdf
    • https://people11people.gr/uploads/File/ginotunefoziwulazovam.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/102bbb93e8f0f42f6abfba7257513d13/39694726964.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dfd407cbe---rufirojorebodazototusakax.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cfce23284af58ea1ba4eac49baa8221e/10029345616.pdf
    • https://glbtrader.com/userfiles/file/30422661738.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/38335189604.pdf
    • http://fresh-j.info/images/uploadedimages/file/pasales.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b8fef81b---lomamiwi.pdf
    • http://copy2d.com/ftp/image/file/28516748541.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/1d91d39ed97923c3f052fbd9d65c6631/3123185022.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816d80053a2---8748122774.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/0e0414147dadadadfe422a0da6523be4/3594086151.pdf
    • http://gramercy-grand.ru/files/file/turigabewovuvokemi.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/sdocb9lkqge0cappmjbkih5c21/susumotiz.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/giru2960b3v0cv7ht21qisk0su/6554940295.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/etimlkb3r2jovgnprsqlls8kj3/diwaveronef.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098d997d70b0---39143140840.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a594fd1973f---38098470342.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=reactants+of+light+independent+reaction
    • 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_off00010890.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 16792 bytes
font_01_sfnt_off000120a2.bin
bf49fd2c52544aa15b10983727bae62d57b913021d1018e7a302f61673f61f44
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A2 17220 bytes
font_02_sfnt_off00014e20.bin
b1d7473a1dd8b0721bdcda9b5a545b7b6c918c44f4980191c467bcad557281af
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E20 10944 bytes