Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4fcbcd42c9dd98…

MALICIOUS

PDF

88.6 KB Created: 2021-07-17 13:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f87fd4c695b7db0fbc65ffa9b4d593b SHA-1: 716d1d5a87ca3ba5e2ceee46d97fea85004322bf SHA-256: 7a4fcbcd42c9dd9854320fe5c7ae58811154d6a81663ee65d2867fc511159d1f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users through a malicious attachment to access these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://paramountswimwear.com/userfiles/files/55595631630.pdf In PDF document text
    • http://woorymart.com/userData/board/file/temiz.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a760135f003---25450641607.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e47d1d389957639d520953537f20e358/1421438620.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/gaweka.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/kizuzulid.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094df4a6986c---kisufixo.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/13672554686.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160926cb84b87d---dumililepaxejim.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/57129113076.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607204cf7d603---18086779963.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/sanofazupoganetirar.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764ac92aa07---92345255871.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/26302205944.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/86894455512.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/vopitikinob.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebe4507901---tunedigubalixudime.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/84221410636.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/fedewose.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/53725159000.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdc8a8d3f---kibokivunilepitinovolu.pdfIn PDF document text
    • http://mebco.ru/images/file/65759237575.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/99320245248.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210603_170927.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/jslth3gfuf2ajtm8d84epkvf5b/pemibudopozaganupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=letter+e+craft+templatePDF link annotation
    • 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_off0000f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 17100 bytes
SHA-256: c11a51f8b569501015243cda019c192924dfc9a5f2cfe49a32cc90e2d11a8786
font_01_sfnt_off00012665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7C 10116 bytes
SHA-256: a82f8fa74a4fd2dff0b4d9c789a098b4933e598381a5cd035335f3a9cdc3387c

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