Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa44dfed3cb62c2e…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 06:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22c89b08cbfd63700f099219b2594e0e SHA-1: e46737650ac744e706d6c216154ea09cb416de75 SHA-256: fa44dfed3cb62c2e7fc6afbf5e645479aa264a9d0614dc6d94e96b37cc955118
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=challenges+app+android PDF link annotation
    • https://ijaetis.org/ckfinder/userfiles/files/bimovajabefasuvipub.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ef381986---pujusexipowaxuvodaper.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/36746791274.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/pirogixupitimudukove.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141ab256fec8---95566133036.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/39677931395.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/jirakikukasibop.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/12110056911.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/bimom.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f137e1e6---56204653299.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/62270409419.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///vevajanegonogejonu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/pqkk1d4ojb4553232b6adkbtsn/48593603478.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/48081668217.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/73432761934.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/fiwalawerusutala.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/77258027070.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/94de48dba74fde8c57fb97bd6cf56359/pujananunamibetod.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/45862015985.pdfIn PDF document text
    • http://www.polni.si/Images/files/17174672539.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/mikojikabefigasuroxanixa.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/tasuj.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ecf72c2cd---fakute.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/lujolubadufabusanuxemu.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_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 10604 bytes
SHA-256: 65cb8c4f783a3d6a3ff01a1e83f43c57a617f68e24b15c3aecd4873137f3abd1
font_01_sfnt_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF5 17268 bytes
SHA-256: 110a2c54bd431c3138dbed6c33962a0fde3854ddf04235f45a386d0d04a5b0fd

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