Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe4afc106e751b6…

MALICIOUS

PDF

84.7 KB Created: 2021-07-01 21:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d925cadf7f153a494f35ee0775165d63 SHA-1: b0309fdf03cf5da3854d087071780d11eb268de7 SHA-256: afe4afc106e751b69537d2e6a4ab3682969b25ecd85a6f200daf697f0fcba08e
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple heuristics related to PDF link farms and compromised CMS uploads suggests the document is designed to host and distribute further malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a social engineering lure to trick users into downloading the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/1a5a409c756f3b33cd67f5b70b461d9e/jobali.pdf In PDF document text
    • http://grgct.com/ckfinder/userfiles/files/8018298603.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/vajozud.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f489750cf8757ce7b7d706f020a1f09f/rozexuratinokobum.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/pgbf6pon8gbbbcvcu027r3qn0c/tibovalur.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c2dc0ca7---mapinofigiwebaguvez.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/0ce203eda9e388614aec770c4958323d/pajejux.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092b6af8b497---tinexurovaw.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/36826245898.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0386802001620224388.pdfIn PDF document text
    • https://bem-sa.com/img/file/fodoxepu.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/5kj317rnibkbv1s9qgph8hst71/jefosutofutepapovo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4ga44vrnvtemeip33lsum0t9s0/nuvebewezalaxelowov.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/xixikip.pdfIn PDF document text
    • http://poorclarescork.ie/images/27670888332.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/27f26ba6ec6553affaeb9f7ee66d99c0/jovuloviwom.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/viwarizukobinuzot.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/favotidowugizivaluli.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/40630714873.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/72972716000.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/bomewilum.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/907a5613aa2ed892c0bd35f6bde84aea/39910945741.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/o8rfn0kk9kpb6083k2sh9toei0/10838051508.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/s0ka648vklv1ma170nhlhhrtp7/ninogowa.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e13addea76afbde0999269b78e29c65e/4261048238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=family+guy+the+quest+for+stuff+modPDF 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_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 17924 bytes
SHA-256: 318bf60b93d9dedf99fb28ec57e78775a722fbed4829c609c6823874f7d8da91
font_01_sfnt_off0001128d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128D 11032 bytes
SHA-256: af2e03eca7a0fe186d0974d979e8df106a696dbfea9f703ca1ec6966326d6b3e
font_02_sfnt_off00012bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1