Malicious PDF — malware analysis report

Static analysis result for SHA-256 b598264bfb92312d…

MALICIOUS

PDF

86.7 KB Created: 2021-07-18 04:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b80661a3d6f4d36fdde1ed4569592a08 SHA-1: 181da6c86d70b81dcd3cb1ff3d53eec9a3112ee6 SHA-256: b598264bfb92312dfb8d33e6f826fb8c92dd40f60f068a4f6fe154724b6ca002
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous links to compromised WordPress upload directories, suggesting it is part of a phishing or malware distribution scheme. The presence of embedded URLs and the link farm structure indicate an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f20a1bfb2---zusamadur.pdf In PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/7f3fb03b2e7b936e26e4f6a0bb78f183/buketuvaponafubax.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/f3cb02e49f4b654e5d7ecf96b5d9f555/nutajasaruluvomefo.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/rebakezit.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41e1a39d09---wikoluzipuzidelebexotosow.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0a09034a2e64ceda626b6b262c98b111/zivixoredara.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/8e3e9cf0eda4b5baa4e64a834c833e7f/44798917369.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/55062261169.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/55023921984.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/zobojude.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a10e587060---15741861401.pdfIn PDF document text
    • https://people11people.gr/uploads/File/50624399649.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/42053066026.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac43dd636b6---4871216771.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ba98194d341a2286fb5ac20afa5c2eb2/votol.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/82106925268.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/1601456385.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae1956609f---ledekopizuwipogisi.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/54b18ba3371adc8e70e3808b0f850f8a/97378273678.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c4e747d5---74891759942.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/4c941c2c20aad4da2998fe667daba25b/webaruwejazaxibozutinovov.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/gimezorozisira.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3127c327c---63133916778.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/vegugiguzerapatafep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+lily+of+the+field+and+the+bird+of+the+airPDF 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_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 16724 bytes
SHA-256: f01270bbf20b0403b16625d8755f3253c6be8891e24546a7f0489a4608505113
font_01_sfnt_off00011d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 10500 bytes
SHA-256: 23660a1f6bdd50a2dc812c1f6275463b91d4c17c178c69b66cf6e2fc6dc8d70a
font_02_sfnt_off00013503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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