Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81365a0a5b20624…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 09:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a74a157fabb2de541fa8a396303c23d SHA-1: 6796dc1891c00ca9ee23423ae390f6bb10950bdd SHA-256: b81365a0a5b2062484b28840166c4e3055aa43fb9fecc078742b3a05f6d03f9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate malicious intent, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifying this pattern. The document body is unreadable, but the heuristics and URLs point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141105a79d9f---xiterejopovonomogi.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142969cbb6c7---lavubufidurelidumonik.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/97246594434.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/gileripiregizimusaduvaxut.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/rosuwimuzagosawegu.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/xusasetegosamisejidamuz.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/vavelaturamovutuxetebak.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/67527539165.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/jeroluxowifitujulepozezi.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/bolifabaluvutugadisimup.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/pufededovoxudisufesuget.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/zejokidexigumopav.pdfIn PDF document text
    • http://prestopc.it/upload/file/92345076957.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/nazizadoberotozovaxaf.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/zapov.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/migomigezabofepe.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/kebigatizotabiw.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/90704037050.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/53d44554c608e2c6e900c96eb487f2c7/bonovolukawefojivovosilu.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/38030814034.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/lts173paa8prns1b63ntl32lpm/8324023953.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0a96c3d90---85876258165.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/62272212052.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/31761018466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+last+kingdom+streamingPDF 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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 17848 bytes
SHA-256: 0fc672bdb4b55a1c71d68bcfffaf2a725b79f67f91c81af64e5ebe500bbfe925
font_01_sfnt_off00010b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 10748 bytes
SHA-256: a3bd1e7c8e2fbfb407809775cbf9a2e225ebd15808d91f74228d54024abf2643

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