Malicious PDF — malware analysis report

Static analysis result for SHA-256 17845d45839c5f07…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 04:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 40efa014dfece7286c391ed95a5c52c2 SHA-1: 42d2fd5b22ce6af1ecc64de7044249ff55c7be5c SHA-256: 17845d45839c5f073ce3c09c1eb28fc3089d6a1202b13bd5949de570cfa70e89
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'utm_term' parameter in one URL indicates a potential tracking mechanism for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pistant.ru/uplcv?utm_term=gta+san+free+download+android PDF link annotation
    • http://agendatourvietnam.com/hinhanh/file/51944247477.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/72973332244.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/jurerabakeme.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/weminuvufukab.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/f6ff5f6bc9547db47489900176577ef8/mafuremunajizavigupobad.pdfIn PDF document text
    • https://t2sc.me/userfiles/65516362095.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/mizoko.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/94190227853.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/6k5cgamc3cjc3maim278l4kms3/45533952383.pdfIn PDF document text
    • http://santeh.md/img/files/26369164045.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/wolexafese.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/8f855833d2947306edb911a3de7c0ebf/labadudofiboxugulatom.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/10312799023.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/8bpq4qlri0uqjfoqg1887fmi61/35046566569.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/0m4mqsgh1dj58smn56dq0j5omn/korubobamusukutixegegidok.pdfIn PDF document text
    • https://carlojans.com/cms/file/kugetamevujeduwal.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/d5da1db21afdc6f18f8079ca00b48217/jolanetiwewaki.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/2de57212819rcl9o4m9pp50p3r/kavubijilajeso.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/1085317848.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/96265317947.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/sutajodagevesazeb.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73bc8049d3---jibisowezogodewora.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/tabesurubipixodutukume.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_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 16580 bytes
SHA-256: fad48b172ad02b0cab20e18a806ae01e8837335138ec56f6403ba5a1422e46eb
font_02_sfnt_off00013853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13853 10472 bytes
SHA-256: 5c5f49f2007d7854b47a277c31e873aceab2b2c931e359a544eca260c37d376c

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