Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce8f1842e9b312b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 21:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0db08309181a64889c34989ccc559a3 SHA-1: 8cbe09fde9c287a11328290d600667147bb2f908 SHA-256: 2ce8f1842e9b312b9bccf22ee03ea8e4eaf6f51bdf3db19bd0815c104ec961f2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f80443fa0---fagesimid.pdf In PDF document text
    • http://texmet.pl/userimages/file/dafomudozufedafisu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236f3f55df7---13182852068.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210817_5A02D89B12DA5F80.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/relatewakidoju.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b410b08f5cf---pigulixinipasipijefut.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/rewedamezutesiwopagupusod.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/26105636037.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/lilix.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db0899c56be---nigofekabegun.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/wowazufirejisopozediwaku.pdfIn PDF document text
    • http://geose.ru/userfiles/file/25210743783.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/48896094183.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/4488788831.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0de3b1926---73588114863.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160771ca1db5ae---vesetujovivavon.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/da8cf72d6b0cd8be391066b51d5e6792/geserewiwumewonuporuz.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/65120652590.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/sirugopakaw.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/patadusazomubuzotoximide.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c70ee0eb7a9c0a13673bf0dddde6f39/7001460914.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/butigaganigikexe.pdfIn PDF document text
    • https://coil.hk/upload/files/84046103704.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f34358250815223a273672b3f8f4c475/rojume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=piyanist+kitap+pdfPDF 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_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 10300 bytes
SHA-256: 397e69de9e131a4e3424f6de74ee99e918234a0833308b4fb16ae6240571094f
font_02_sfnt_off00011260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 19616 bytes
SHA-256: ab1a1b598449fa4936b7fb23d2faeabb1cb5ab2e86eb152f901423f59c3b0dea