Malicious PDF — malware analysis report

Static analysis result for SHA-256 36fd807f26629c9f…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 11:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9bb24c0017b7b36640bd347567e5d0fb SHA-1: eb31b53ad5cc508536e0dea7540983ae66a2f57b SHA-256: 36fd807f26629c9fbffb30eab631de023e2dc59ebc61b6ecbd19edf5db4e00cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads. The embedded JavaScript likely facilitates malicious actions, such as downloading further payloads or redirecting the user. The link farm structure suggests an attempt to obscure the final destination and potentially leverage SEO poisoning or compromised sites for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c00f0be16d1---11066965385.pdf In PDF document text
    • http://pspectr.ru/userfiles/file/bunuduwobodimad.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/famakimavukofewo.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/61c80c8b66d95486ddaa3fa22c257c54/72736852949.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/1521c4684bb0b291341bfec55d267255/37992113683.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/lukuwinowifujetebenener.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a353ff97006---livupapedajuserejilejiku.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c80448aec---fexofikufi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608408bbb2c53---dituxobevevibekanalolo.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/34448252953.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/71310654271.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25f5d30bf---ruvugafakuva.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6fa6e250---50102010104.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///gebexixobowutuwemevozok.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/jutavosunako.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/33114694751.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160cf96bb242ee---77249154601.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/palaximobasozujagipa.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/diwaziroguwupobojofel.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/58244211877.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/66766029794.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b441be841d1---wegamituvujatanilukisoxa.pdfIn PDF document text
    • http://vhshf.de/File/wilifedixurukofef.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bonigobigorafidufoge.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/rufobazerafuriripoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=happy+birthday+song+mp3+download+teluguPDF 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_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 11444 bytes
SHA-256: 62844af06d38a517f1befa95d2f54a088c5472444a866f41531c0a34067f2cd9
font_02_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 17112 bytes
SHA-256: ebfafaf4730fbc216afc86f81a44f21a930fbe6f1225d075f7c0b2a621554da0

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