Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac90ea62bd495bcd…

MALICIOUS

PDF

86.6 KB Created: 2021-07-02 09:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55aad32d50bedbc6e10a338ac1d27f2f SHA-1: 6f167000cddbbba6d8d16a219dbc72e3aac0205a SHA-256: ac90ea62bd495bcde1e94498caf8787864062dd9e2d58979efb7cc0ebf149f86
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, including WordPress upload storage, suggesting a phishing or malware distribution campaign. The PDF structure and link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://archism.ru/uplcv?utm_term=unit+1+scientific+notation+worksheet+answers PDF link annotation
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/fcf70468a5a36fae4ddbf7a4589bd7ca/jozexakadajubajikef.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/40611130161.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b691293802---javunagirele.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2ccd6cfeecd39b24c088fff4c798bc7f/92728178131.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/e83oj9c96qi15b5ao1kabafjq3/bagofidepumenabusurux.pdfIn PDF document text
    • https://qnzar.com/files/jilapizejilaroliriwiwobud.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/26687655580.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/84868272600.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ip9899fk5gkcgap40nea2qatp5/3806084923.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/gigetixiwivopev.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc190bb8a7e---kemarewimazerilejita.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdadf6af92---67998762033.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/81763549790.pdfIn PDF document text
    • https://lasanisports.com/files/toxupi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7877690e61---pivabexavupumo.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/5060056552.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c519bb51d0---pudoze.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074709551911---92522890691.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b83bd9219---23690111706.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pc5oiq0dp6k4k9bumb30nh91ae/33085703658.pdfIn PDF document text
    • https://biocoils.com/img/file/47724651966.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/lifetadeva.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/63664165285.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 16676 bytes
SHA-256: 555bba17bc267794a72577ecb2bf01a7b433a47d614818ba0dff2f77565a3bc8
font_01_sfnt_off00011c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C71 10624 bytes
SHA-256: 7b605e131b6958df1450b2b9a2995971c415314eea1f7fc7aeb470b7d0b6f874
font_02_sfnt_off000134d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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