Malicious PDF — malware analysis report

Static analysis result for SHA-256 939e545fd93f7433…

MALICIOUS

PDF

76.6 KB Created: 2021-09-01 06:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a691454d905c35e212e8bec85716992 SHA-1: 8faae054c6f868f196d311f40b81f5925b407b8d SHA-256: 939e545fd93f743383f76eb5412a0f3eb010a4a51fe0f0b97f8b47cb5b2f349e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains an embedded JavaScript stream and a large number of external URIs, many hosted on compromised CMS uploads, suggesting it is used as a link farm to redirect users to malicious sites. The primary purpose appears to be directing users to external URLs for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pistant.ru/uplcv?utm_term=identifying+independent+and+dependent+variables+worksheet+psychology+answers PDF link annotation
    • https://gachbinhduong.com/upload/file/dilava.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3disjrgkh8jgq0siifbht6ic1t/mulipunoxuzugapimuk.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/18119924856.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/45743503243.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/95375769667.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/28653187055.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a5258743335---30076936050.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/zokuzovuko.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/10592749159.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/8d42f4ea24e4bffbf83aa5d29628a9a3/dinipixuzijabunosavegux.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/befufubesejofoxi.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1a44b1d09d9c9c2074122bc284299c0d/voxodasulugukeramafuv.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/fuwakori.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/86891204718.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/93749577745.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/luvinigatubiwosifotuvas.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/72542958398.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612357d9b83b6---48740064280.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b5329f943---sunigazinorepunedobikov.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wisakurexagivabazijobaz.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/40476184494.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/puradezofejofap.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_off0000c6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 11348 bytes
SHA-256: 335bd4a120e6f0be0a446cc209543e946e1db1c38a8a993d071f43a4aac14f6c
font_02_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 16536 bytes
SHA-256: 64af22a05ff9f7e3ea314a40c7a0f31468dea84d2ca6643085508d7f732d51ec

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