Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5ea421c2e487a4…

MALICIOUS

PDF

102.6 KB Created: 2021-06-30 11:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d4bdedef74d0a1e45ed1b8e9aaf232fc SHA-1: f584c14bc4afe50fb379f8e2c51d1bcde798f326 SHA-256: 1f5ea421c2e487a4075ad4d6714bbb7486ecc04655e1e321a211fa7392c50494
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many of which point to compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://popnmusic.fr/userfiles/file/75279183049.pdf In PDF document text
    • https://kham.vn/userfiles/file/rixozelujej.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf51df9ea5b---rapepitirigitirutirido.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/gavufokipoxodifedoni.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/699d8ad47a1e9d6915e2a0a8a7e1ddb9/ripabedoduximijixa.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/584630676a3cadb02dc87988b1fed4d9/laxitoxukevuvunilapigovem.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/jelubatifilowatugedodit.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/taxurarifodi.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/muwis.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fvqd951aq18m69iito55fephe2/pademenepejonuwelopif.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/33569350091.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/3d988b486e7ed9d87640ec2d78b0991b/fukog.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/fesito.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943efbad7d7---rasurajik.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d3e7bc14f---jeleweravesizopijodidut.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/35751875012.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/v9nesobqqmadeennh58s8dm2or/10028040229.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/h9ifjr338q91v3mgn54ufvogne/71956272925.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/dovufunuguxivakudug.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/23876865216.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe2b34d3f9---jazalefara.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/93653751255e52479ee09c7b0aa99462/24433703946.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/10930429072.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee949826d---vutinofaniw.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c7b7f5529a879ea16be01c09edbc6582/6148918500.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0c002c4be---66582068332.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/96626981187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=can+snakes+lay+eggsPDF 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_off00012f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14790 10108 bytes
SHA-256: 81afefd7f11a469d29df8559f634e687889114361dfb60b5ec57a0d86905f4f3
font_02_sfnt_off00015e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4D 17412 bytes
SHA-256: b8656d95703d957ed02b47117df7b3a7dfc69266a417b4d6641f7ae2cd2536b1

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