Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafd81587429c85c…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 17:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e0076e57852321481a3041044f19fcd SHA-1: 0d8f4090cd7e5b3ef27dbc13cd26affdac1c2d5b SHA-256: fafd81587429c85c5eddef68baa827c16a3fed303c708bac2254891a832185bf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's part of a link farm hosted on compromised or disposable domains, designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crewmak.ru/uplcv?utm_term=best+way+to+get+v+bucks PDF link annotation
    • http://toyteepee.com/uploadfiles/file/210906135408892178wdxib1.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/rumamizoporufujexirabeg.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfac499c88---bonanenodi.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/zovaxipalutujutebewidaxo.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/bilanoxuvu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613829419b8c7---mibujukuvuzewunokam.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/57163222235.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/55169217064.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/xemepi.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/rerajetamigefawukusobu.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/vasasodukemapag.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161458b063b4a5---medimabowub.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/65237375611.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/davovedapividefomom.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/girak.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/7106633870.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/rukesakuxutelunakud.pdfIn PDF document text
    • https://micsys.in/userfiles/file/42510025683.pdfIn PDF document text
    • https://nistd.in/userfiles/file/35242542789.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/81818682376.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/16136473020.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/62107255017.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_off0000b0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E7 10716 bytes
SHA-256: dc8edf00b8f53182a99f940010a721d93a1feddca98f2d0d75b97b72ee5c6d5e
font_01_sfnt_off0000c9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D8 14308 bytes
SHA-256: 65acc676e5eb549d38e61bfe554fbacd6ea9920989a586bf2d7590e6823fbb2b
font_02_sfnt_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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