Malicious PDF — malware analysis report

Static analysis result for SHA-256 04778465fda83862…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 10:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a777374bd54872432c14f3e3dff242bc SHA-1: 798bb1a51d2475a05cb35ea97196489743283984 SHA-256: 04778465fda83862ff6e72172fadf4708f622d6321c93f0f1f15981dbad5c54f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the PDF and the heuristic firings suggest it is designed to exploit user interaction to lead them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://restokrat.info/userfiles/file/1816409273.pdf In PDF document text
    • http://lollanaclinic.com/image/upload/File/sozaguxuravegabazefumu.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/luvugara.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/sedejixoxoxupov.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/36115681398.pdfIn PDF document text
    • http://egitara.com/upfiles/files/denexag.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613084fa1b690---8265358360.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/dbrr8atsfe7n7s7u5goe27cmh3/degemovonudorufi.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/24686598089.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/zezipekedobal.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/87189439236.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/kikimud.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/lerebizupoxit.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/zevipusis.pdfIn PDF document text
    • http://moneymaker-gold.de/files/58249843139.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/zikogexiredavebaw.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614724ad2583d---60279056855.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/26010797223.pdfIn PDF document text
    • http://etkenkalip.com/files/libelopixizenawobitu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7817ed63f---wiladigar.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/fedamoza.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/kidon.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/berilosamirak.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/25484897409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+add+custom+emoji+to+keyboard+androidPDF 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_off0000b30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30C 15444 bytes
SHA-256: 32e9032a50b81897640a434d9c82ca494f12fb699dd83bb83239f76729994abc
font_01_sfnt_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 11140 bytes
SHA-256: 46dae190c5b90b33aa9f5e0636311765e20113ee463babb36ccc44676a9b2150

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