Malicious PDF — malware analysis report

Static analysis result for SHA-256 901ea23e7b17bfba…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 06:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd8d5fa77400d79214eeeb058ac64e75 SHA-1: e6857d130d6f39e91e93213a6606c361ba5b2a87 SHA-256: 901ea23e7b17bfba913082d742d98c1466ad5794472e0e914e2f17eaba81ee8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of link farms hosted on potentially compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to redirect users to harmful content. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=canon+rock+violin+sheet+music PDF link annotation
    • http://erbamedica.org/userfiles/files/69862518673.pdfIn PDF document text
    • http://idcla.net/upload/files/silerekutimimul.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/pebovonovelotogezer.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161370b7478234---19283727612.pdfIn PDF document text
    • http://esipro.be/userfiles/file/55097118917.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/lm57qfggfjt28lkf6pvuq1vkv0/28736718293.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/41937378188.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/mosatapafolulopiboratar.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/musixof.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/najazafituxe.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/vanokipekapimakunowido.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/vuxuzalitereviwipemusuj.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/xanegexox.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/zizuxesunasovavosipinofa.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/kaliwime.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/babufowinavokeliti.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/41445977848.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631103958.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/muviranoreriwakezeva.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/351d473becd0fea9b048acc8296321f0/63914518545.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/buwupex.pdfIn PDF document text
    • https://ka-base.no/images_students/files/31724256165.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/potegiz.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/wizikewibejajojefa.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_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 18744 bytes
SHA-256: 571482ff971a657976140c9ca83d4e8bef9c3dadb4a21569eb6b22b5ca69d2fe
font_01_sfnt_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 10784 bytes
SHA-256: 653d556c8cde4964a6e3f1faad0f68ed2f96deb1cc8d67617e0a002af9bac1a2
font_02_sfnt_off0001225f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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