Malicious PDF — malware analysis report

Static analysis result for SHA-256 083f35e37c50d649…

MALICIOUS

PDF

107.5 KB Created: 2021-06-26 22:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 6156859e2ae524897b9ae9a1d7cb6527 SHA-1: 58c857896526e6ea69c301d0dc4d356628017d63 SHA-256: 083f35e37c50d649e278b78b962305d6cb3e038148874da2a69f86f32ff2fd67
204 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high-risk heuristic indicating an instruction to disable security software, which is unusual for legitimate documents. The document also functions as a link farm, directing users through multiple compromised CMS upload sites, likely to a phishing page or a second-stage malware download. No scripts were extracted, but the overall structure and heuristics suggest a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 http://ekolojikweb.net/upld/userfiles/file/belatozinezu.pdf In PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37a8579d45---vebigi.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/hfe2qmu8b7o2p4g0t8jsliau0p/5670101246.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/c67419824dba2eb86c3b13fcb64d03b8/puviguwowemufiwi.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/fasopadev.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/181035362.pdfIn PDF document text
    • http://teraval.cz/res/file/65131438426.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/riwibubapudowima.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/968a7ecc812e91834bf4326be78dae9d/zanulijuti.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f12b2c0a19---fofuxu.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/26562801752.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tu6s49dfvod7hv7b829ipm1bf0/domidetaw.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/76587541107.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/90d8df81f688c96f72ad8c62394392b0/rerarujavidadazonoxa.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162206597661.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/57814351186.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bddefd4d7e8---80474010757.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/zajekewajuget.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/2296090198.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/bidifefo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dff38bc73---72368026665.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1d98b3574f327c81b104523c5ddeca7/19574912171.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/45842199381.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca058196640---vadeburojodadewono.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd78f18e0---95663902061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=need+for+speed+hot+pursuit+pc+trainerPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BC 16748 bytes
SHA-256: 8fa3a08d8098087d2a814513b60414dc1739f956e5fe7f77adce2a9871caee41
font_01_sfnt_off00012daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAA 20788 bytes
SHA-256: 2fa40b5b268d869a5c6d53930494ea64bed4744d4f481e0031303e6ba1d8ae18
font_02_sfnt_off000162a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ABC 10748 bytes
SHA-256: 01a94435e02556dfe1434c4a2556c7b58c9056cc4f4159982acf2412137f6fd8
font_04_sfnt_off00019361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19361 2988 bytes
SHA-256: 007d28f7e703997c2a45620ec26a02ff73caf9482130cde3f6d5229fbdb75009

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