Malicious PDF — malware analysis report

Static analysis result for SHA-256 4858756daa6eb05e…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 17:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 730c2f3c6b38784b29781b553d6ab54a SHA-1: 93584c7083d777f2760d7775f1429dc00598baa4 SHA-256: 4858756daa6eb05ea76e132e0ccaf83ac184c7847347159eaf604cc8fa0eb185
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting domains, suggesting a link farm designed to distribute malicious content. The presence of a 'utm_term' parameter in one URL indicates a potential phishing or SEO-based lure, likely attempting to trick users into downloading malware disguised as game mods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oniceh.ru/uplcv?utm_term=gta+mod+android+download
    • http://erex.hu/upload/file/49042765866.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4d8f3562---45086774858.pdf
    • http://matstravel.ru/userfiles/file/fimepudabatovafopewe.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b4ac3c6e9---xevolejopopemojebor.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16073a76552554---bugupogubogitujasid.pdf
    • http://www.aluvascientific.com/UserFiles/file/19275165711.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d8fe13dea---13787079115.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9700eeba67---begedipoxoginizanomaduzos.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/52beb6517b302b2b0e6cfbf0443646b0/vulepimutetisusoxuxozo.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdd05c55c3---mimeg.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24cc44d3d---degebituligododuma.pdf
    • https://edubox.mn/uploads/users/0/files/palafamatofij.pdf
    • http://apexibd.com/uploads/fck_uploads/file/33368092824.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16085f2db46c00---zusuxutorevifewa.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160832b0a1b9dc---96771543585.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160abeb74eb8a2---boxajupazafilenuvipawuva.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb4a81b2e0---60074525404.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b39744a9c28---51181139455.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa057696d7---43637815830.pdf
    • https://pet-fashion.ro/mm/file/3604223371.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a99bd588255---guzebaboserimisuvem.pdf
    • http://seabeachthailand.com/UserFiles/file/vakositosujezoze.pdf
    • http://aelma.com/sites/default/userfiles/file/85712924606.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f806.bin
f484498e535643d18f5354e926d1dd2b81ab2ef5012f858a56d4ba4337d5e824
pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 10232 bytes
font_01_sfnt_off00010efc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 16792 bytes
font_02_sfnt_off0001270e.bin
8799212401e19932645b243671140f82b626b5e236dae8ba7e6651e0509639cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1270E 17708 bytes