Malicious PDF — malware analysis report

Static analysis result for SHA-256 64773db6a5f421c1…

MALICIOUS

PDF

151.6 KB Created: 2021-06-25 19:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 94f44ff7a99079499c3c7fdd9f6053bb SHA-1: 348340b8d10b938943c8d75ae24e02934065c4ac SHA-256: 64773db6a5f421c12929359e0367f7e6a3ead9b7d8c189114f7c4c2fec5629dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to PDF files hosted on compromised WordPress sites, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports a lure-based attack pattern. No scripts were extracted, but the overall structure points to a malicious document intended to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad37ece3fd7---58591621678.pdf In PDF document text
    • http://tgtech-auto.com/userfiles/file/83831014729.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1e084f98e8051e884ca804de676a26d7/98788497811.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/33069478279.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/panigib.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9367e801---57966495476.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/82045045412.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/08712115e477a4bec2ca7e3f111896cd/70454377716.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b69d73a0---tafofixutewizemobega.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/gapawodutajadudubapipibun.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160904aade2192---dupati.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c11857236b7---58742625381.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/66474848172.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f3d07b64878476e2c6f6eff5c7482c48/nusapaxujizejifabivaj.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160778a89765de---zitebawoj.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda9c47e61---tuwologilajubali.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f9fe6987bd4fa0fe97d03078a469ed7f/64849293164.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/dogavobipa.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/er8beme0t34vv13ea24asf00g4/97517987668.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098397a1594d---kunalojodim.pdfIn PDF document text
    • https://ijpdua.com/contents//files/dovupapapujilusajezi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7eefd77aefb5186f356da5c817177b2c/nukavogexaravilejakeduxav.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/eb6426b50e3b9e4351fee2f6170d1966/92760852850.pdfIn PDF document text
    • http://apvn.info/userfiles/file/lobasijezus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=first+year+higher+secondary+examination+march+2020+physics+answer+keyPDF 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_off0001ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE19 11528 bytes
SHA-256: dc1a10d100a679d93abb2b7722207df87ab586ef9a4e71c1863a68658a705e58
font_01_sfnt_off0002092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2092D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002213f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2213F 17052 bytes
SHA-256: 56d877d9a2659681aa4862751c89cfa78bdc05f11519ced873ecfd351c4d2cd4

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