Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b01b33092d8740e…

MALICIOUS

PDF

84.8 KB Created: 2021-06-26 09:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d13b2211ef1076932b97337fe51132e5 SHA-1: feb344507751af5402c8b5d6a4ead6835059405d SHA-256: 3b01b33092d8740e57964b565fcb8d39e18d56e45dd57a5ea225a1afcf6e4f64
176 Risk Score

Malware Insights

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

The PDF contains malformed streams indicative of exploit code, and numerous heuristics point to it being a link farm hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent. The file likely attempts to exploit a PDF vulnerability to redirect the user to one of the listed compromised URLs, which could host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://n-zvuk.ru/upload/file/gosebi.pdf In PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/8c3840e74ed4e616aaf5a90cf3e50246/jawidubufopegejamifo.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c684806e0bf---xupidisap.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/momirinoba.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a683c023347---labirajefositoduxog.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816b9363fc4---daditizikuz.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/gelulobuseririgojawogan.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/d2kbe0b4po7osmidrlvrm63s51/ruveravaradabamupasuv.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca4d4f1f2---tibupovexatezarudom.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/nesibadewinadobasixa.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f658083666---57656551678.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/8608717825.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/govinuvugutokanuli.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e751e5f3943951e71d49016c7dbb4a55/gidovenomowix.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/28607f1a5503d00bfeb9f07d273a524d/80973369416.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/34ctlvgaaa1dasl22lde7j1h86/58733745882.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ccd453fa---84870838304.pdfIn PDF document text
    • http://epmachine.ru/d/files/38933862083.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/41623421506.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc335d214---zotamagejafajak.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/80674354655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=analytical+ability+test+with+answers+pdfPDF 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_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 10916 bytes
SHA-256: 6452dbfbd4e086aeacbc8464183ddb836285ac5d070d80665a61f2f7713a1113
font_01_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C4 17172 bytes
SHA-256: 03d22824ae5e7447c9cb102b27ed0fa0b2b4224c03761e2f0ccca8d901f8ebeb

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