Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f75b23cf3183211…

MALICIOUS

PDF

84.5 KB Created: 2021-08-15 10:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0604bef380743693847d50f445e5005a SHA-1: c8545872d6d56afa392487e2a32a4307e9c5ea29 SHA-256: 7f75b23cf31832112ff602dae67ccf2076a2c4e3536c687cb18c3c784031fa12
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, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious payloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=what+is+the+meaning+of+elan PDF link annotation
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa590116b95---63913762561.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/87723581421.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/kekidutove.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce6da95cd1---33243355472.pdfIn PDF document text
    • https://magerp.org/upload/files/xeposeg.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/zekemasibukuxodini.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/lu7tmccqojtsfaqkbekadvd5un/42308294498.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/e52b3e096a6ac21c6644a28abf281b5e/54833343925.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/lidupenewikima.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/2684782600.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7f564b1bd---10793050995.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/bc0add88f3e70b15b259a4e336cf3787/sujeguwuf.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/vqppjso7ici8l9fm5tql1hfgrq/27244837218.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/muleganasom.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/xebura.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611299f0c0337---majivexiw.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/7078816627.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/7883724591.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/rexutalutirefefiti.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/lafodepasugesuneguze.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa2b471db5---vojogodabanude.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/779465332.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/fomagibovax.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c97548362c---wiziriwotetubetetegozomu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAE 18504 bytes
SHA-256: 6d634f65633af3e070ffa20b1c0d1b721de73b14aa537231e12528b5266cd07c
font_01_sfnt_off0000fdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBA 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
font_02_sfnt_off000112cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE4 10552 bytes
SHA-256: d3ff8645cd8c88d258799928a144065cae49d6b6610700e4870f5dbcac43c14e

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