Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dab4f8659836311…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 05:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a4fc9b8ee2d1253b25c7e84cc87600aa SHA-1: ea7e36bf500649953e114831017b5d1c8c85a46a SHA-256: 5dab4f8659836311ab614a713c6a3b38db49f7458708d69edd7fab2ddd014ca5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://garglob.ru/uplcv?utm_term=how+to+hack+wpa+wifi+in+android PDF link annotation
    • https://officialbacknumber.org/editor_up/birijebemexetadiw.pdfIn PDF document text
    • http://yibetter.com/data/files/40535248540.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ce60511bb55e491ac667421c5be5cea9/lodezetinetigixugodutodip.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/97435649152.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/74047458239.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/tolaz.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/vikapufizemefobojib.pdfIn PDF document text
    • http://kgmda.com/upload/files/vojilovepixazu.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/sosirilumabatu.pdfIn PDF document text
    • https://digireg.nz/upload/80999094267.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/31582222192.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210902122635.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/36504736774.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/61029453577.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/masizadivegasala.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/lelosopekojiditadepixe.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/xikovukabijalavil.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/72362352978.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143f86683752---ralebodapisadevizevevi.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8ad6ecee8---puwet.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3e4571537---82431829932.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/62858821592.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/13955142801.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395df62f959---68386115646.pdfIn PDF document text
    • 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_off0000b9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BC 14996 bytes
SHA-256: 342e9fc1d6c19beb7de8521624c0c5b4f0d3231b4422c2f908cac0ee1a0ab2b8
font_01_sfnt_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 10540 bytes
SHA-256: 46caf5bc2d5fc4dab633108c252133384ac2c6f2253d6eed8cb288aaa685770f
font_02_sfnt_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1