Malicious PDF — malware analysis report

Static analysis result for SHA-256 833393898f689aec…

MALICIOUS

PDF

67.7 KB Created: 2021-09-30 13:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: af282b509c788b001921dca1a6ee3e59 SHA-1: 6a6b99a825136b36bf682cbd03f344e21800f8d9 SHA-256: 833393898f689aec312420dd2a671c6ecb3ca0d6578edc91bb866cddff40c067
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting an attempt to redirect users to malicious content. The PDF_IMAGE_LURE heuristic indicates it's designed to look like an image to trick users into clicking through to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 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 http://gmtshipping.com/attachment/file/fipemofo.pdf In PDF document text
    • http://jlicentral.com/images/authors/file/rofasadomew.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210918111928115451dczcb.pdfIn PDF document text
    • https://okazionche.com/files/dilubutobitonadoxerefi.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/89427681831.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/15466680175.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/mukal.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/gerototokulolumitemape.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/74rk4sfdqtlltfpb9ln4cituj1/fogevetalimumev.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/xiretuserupure.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f31270205e---tagotiromefetilemefebe.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/wiredesixunikim.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a45cbb7360---dunataze.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/3748089026.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161382a2bddd45---pezabatidufabisuxiw.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/94965541571.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f157bf2fe---66519980156.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161557e6578f4c---wimijukexar.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/7324115374.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/gelupuxoxuxajobo.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/gijawixosabenozegolefelur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tera+origin+apkPDF 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_off0000ae81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC698 10172 bytes
SHA-256: 6d2b4b30a4c9f4cb23d49c455878a4d783b02aedc1da274777b4b6751807e879
font_02_sfnt_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 14280 bytes
SHA-256: 7982d2db06a199946289b7e0e0a5d651dae0d48e4d8963c0b814ae77b458b458

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