Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc321087d84cbdc…

MALICIOUS

PDF

83.3 KB Created: 2021-06-09 20:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93c8bf3a8d435d5ea117fa1b67cb5248 SHA-1: 857ec7e02480ab4a0f290dc10bb65c55983d9fa8 SHA-256: 0fc321087d84cbdc711f5e281e4b996d01b5861da41fb30db2d016530eb930a2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=5+paragraph+essay+graphic+organizer+example
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/klsofg01safdjqf17bslu1ren4/3920510633.pdf
    • https://elektrona.cz/files/file/nexuzamomupuvesuze.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dd1c0f1b7---53946894673.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608378db154b2---87969667370.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609209dd513fe---kipok.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dfc5bb2ef---56058711550.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bfba6e2bfaa---82136112670.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55cf6e9706---26651424155.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/3olt49rd9qov83n8ukj3ruvpsd/66228235471.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f74e3aab---35627421894.pdf
    • https://samarpanbharat.org/trila/userfiles/file/52692758266.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607443e5e0c6d---34189410351.pdf
    • http://dzbnf.com/upload/file/%5C/vegulegikejowasuluwasit.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160946243dcd22---18756597743.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/fb53368e2eb0fd2e3ef7549014d3695f/50597446587.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/avba0d92iilgrdnb67mm1tg0r0/42714093392.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4cd56c1b2---89765780697.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106b8.bin
0dcf2e9e222e272029e7b4b455957486397b7ab7658e02c7ca338a33b3d70251		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 5596 bytes
font_01_sfnt_off000119af.bin
c95b662dccfdebdb3f0db295cecc7fceffd5499e5744289e2289c2ee792bc653		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119AF 11036 bytes

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