Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78c2a5c94c18b51…

MALICIOUS

PDF

95.9 KB Created: 2021-06-27 10:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 59a9e408685c27ab513a8d9ccf34e3ad SHA-1: 8e3aa1c7248f3cc217e0f467cc4b6a85311426a2 SHA-256: a78c2a5c94c18b51b78cf5d50ca70ef40f360d401831effda060f9a0eaea0e90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous unknown URLs strongly supports the link farm and potential malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3533da5b9---bulagujuwosapujekujose.pdf In PDF document text
    • http://cosmik-kino.ru/sadm_files/30585183401.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/keragefepajekuriwosun.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/zakilufapivazugurog.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/hcbrcuh4efh1l4ocppol5q01im/98238905997.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608266e00ae16---lemaduworefanolakep.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/69b33f577030f3d13015ae37ccf2bc4c/mazogena.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/72091926250.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/penaripinabupenu.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/galininapaluso.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/ba78b4818e5c55dcd0691f6692d9b968/pogonavutonulufosofoke.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49d9a80df---47048538554.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/misipelanutijaruroxefa.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/197mkiejbmltg2kq7180ga2qlq/dasoxubonawukide.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d803611c2af---52766639492.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a0f41d402bf6e913a8cdeb5c871c1081/71936323308.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160882ff095eb7---nijosutijelizudogan.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882b3209587---66187842116.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cf33d69f8---vojugomozegakajav.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077518c27310---gopepidakubobexexun.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/97426625583.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/73454030619.pdfIn PDF document text
    • https://noddy.nu/images/file/sukop.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aca246cbfb3---75899960185.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1c4909fe806769d4b85cc5e9173a2123/vumojazodufumig.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/1841559751.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/aa979eb80c34e54b92c585fb49040b0e/xifamabawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=extremely+low+thyroidPDF 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_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13066 10364 bytes
SHA-256: 1381e1226d8fbd2ff464e9b6fab9e84fb9f4ad3d60834b52acdfb807f6624084
font_02_sfnt_off000147d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D0 16448 bytes
SHA-256: 6cb228b2fae33748a5c5be3054bdbde19a7f011b50098222fadf56cf828f7347

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