Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efd85e24e47f753…

MALICIOUS

PDF

87.6 KB Created: 2021-07-07 01:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81d15b23d097edb6ba213e1b8fa8cb7e SHA-1: 744eb2ce59c6f910a68d04fd74cf6441fa445ae9 SHA-256: 0efd85e24e47f75336f11a5ca85fa8df0748c39e6f0846d94cbcac3b61bd91a0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites, suggesting a phishing or malware distribution attempt. The presence of these links indicates an effort to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/refijekijev.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9e275f048---bigavezixir.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc658d5f6a---63503935206.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/7fi2bs7ujajvj7sor30d440fs7/senut.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd118da7c7---65617688112.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077acdd3bda4---fekolekerug.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/fcbd7a44149085a6239a6d95c5d22a11/51770112129.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c969901b97---9645759850.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/cb14df6f49ccbffe5c22222584731fde/62625416367.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/cfdcccdd1e7540db2401e0496bc7e416/45447589172.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c14d6857---dofowu.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/gatiwisurowolu.pdf
    • http://hondaototananlongan.com/upload/files/4125351695.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b682ee22146---sunazetajikepesimixe.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/7e48d702048c8144e86dd78a972f54fd/97538712240.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a651dc49707---7051243470.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a83833c96e2---64192870569.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c3d565f7f6c5a51b4dcfcf2676a36206/8354568295.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab71de2b609---10233433512.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870134f3545---zapakipofenavor.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5fc42cd84---79714701594.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16092e81acb7c8---12368856253.pdf
    • http://banghetretruc.com/media/ftp/file/70775081283.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/65de26e87104127ccf4a807501900392/bazibo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+text+reading+software
    • 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_off0000f20d.bin
ad279dcd97f152542a0f1c2d054799f1f1600a6b512db3035c075854fc78dc47
pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 17740 bytes
font_01_sfnt_off0001208d.bin
5b3ee909cb64c652fd737118bb9b73e8b96365d23f52b22df0d2a981653c8fe5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 10672 bytes
font_02_sfnt_off00013909.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13909 16792 bytes