Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd591f28417d6e0f…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 14:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a8fdde935ab21a67914ab1fdd6dcb40 SHA-1: a40a374c46a01ad1026c41bba03ac2d180720a26 SHA-256: bd591f28417d6e0f7c111a8bb18b05111b1f805f9c986c788c60a34a1f423522
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and the presence of a link farm on disposable hosting suggest an attempt to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a tactic of using non-clustered links on disposable hosting, often for SEO poisoning or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=chrome+apk+latest+version+2020 PDF link annotation
    • https://belretail.by/ckfinder/userfiles/files/63106499739.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/15684654829.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/55677153104.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/wesuwufaxuwitavi.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/gesepebegasunogaged.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066522e7ee---26615913494.pdfIn PDF document text
    • https://europartner2.pl/uploads/kilapolilogipugabuwo.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/52086948441.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/50047163741.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/maxedewenataduvagunojitu.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/navudum.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/kajogiz.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6c6182fb2adb3b7406401d378447c91c/koregugilemitoke.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613044df51945---80462747242.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/56941283175.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6945b0f48---zasozivemuwomabupanugi.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/zojupoxumemojesebiwamexat.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210922233321.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/bupizufujo.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/34422753191.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/83454560822.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/gezur.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/wokavufitifafuxezajit.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_off0000b17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17A 15880 bytes
SHA-256: 31d2d17688228f642e4fb8cfe1537975f61881cb90aca31e4eb1a6728d34c7d2
font_01_sfnt_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 10948 bytes
SHA-256: 0c75d8a4b198b2592d7f9638e1f99fba5a1b4d5f768ef8df8c0ab6a8fe5c823b
font_02_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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