Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecdca460d039b35…

MALICIOUS

PDF

93.7 KB Created: 2021-07-03 11:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b5c6261b2060f80746f9062cd23a3749 SHA-1: c765b73d9675030d1b3a913ea96243fb8ad884ce SHA-256: 5ecdca460d039b35d62243f0240f8abbb23f02437e984e914f6feedb7f167c77
204 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it is a link farm and a browser installation lure. The document's content, though heavily obfuscated, suggests a social engineering attempt to trick the user into downloading a file. The presence of numerous links to potentially compromised WordPress sites further supports a malicious intent to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/45652b2ab6a32b62c921c2a5e4ebd782/mokefuvazukugaruga.pdf In PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/gp0s7ph7sfo1e5rg0k7qa8oga6/44803084606.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607313d8a87a3---8266493731.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/98ccb5424cba407b4f8a3664c78a6f7e/bomunelugenoro.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/78558705266.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/zulisowafulefakobedula.pdfIn PDF document text
    • https://dm288.rs/slicice/file/64544436098.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607496c636f08---ramukenipuxonekezimi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898c93f1292---bofixod.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0359abf0dc---weguxugaziru.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/romafuxuzu.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/36324405792.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/tanakeligevanixolovujex.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4e2a11675edaf7d83de73ce906a93ddf/fowijibubomotijo.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f7b0a8e714fe0e4e6ae39e70b1b83e2b/wisutuzagilitosekirufivu.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/c02f76856ffc44a5effc928433ffe741/45772786200.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160710163a6148---vadabanak.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/33408148983.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32947aa111---57970944185.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/77030202593.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/sepawomisinaginujibumax.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be4862ecc4---jikomofofagabutum.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/rexurev.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/41482388260.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/zoxeguziwegikiguribativez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=idm+for+mac+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 10316 bytes
SHA-256: 00b3d771ca2bc3f1a879c96e881c17be35608c6a3a92889ac86047eb9976041f
font_01_sfnt_off00011226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A33 1668 bytes
SHA-256: 0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa
font_03_sfnt_off00013223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13223 24428 bytes
SHA-256: 0e3b0bec9e7c1122478b6345e4d5ae5a41ccc907be58dd47ecd70c1f9217e039

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