Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08170bdf73c4dda…

MALICIOUS

PDF

78.7 KB Created: 2021-06-26 21:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ba2dfd64a921910e81561059046c230 SHA-1: 0af56e4b673fa6b0f1d65b952cf8da3e5bb1454b SHA-256: b08170bdf73c4ddaf064da096fa9228a7942e0f44c3c3e3fdd7b46b6dbfed5a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external domains, many of which are hosted on compromised WordPress sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://archism.ru/uplcv?utm_term=area+and+perimeter+of+cuboid
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842f2832edd---lawurupobakafaxujaf.pdf
    • https://immobilgold.com/file/somezapatim.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3dbb5a5c4---kovog.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2901066c---tefafomiromideronutupegu.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/80638092133.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bc614dde5f6---pizawusadepaxaluwop.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609796ed979c7---ziginenagerudavupig.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607668fcdd49a---fopatezowogori.pdf
    • http://geose.ru/userfiles/file/xujibawiji.pdf
    • http://tubietelbar.hu/uploadfile/64500887437.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c9237f189ff---sezer.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/pmg8k1o0cp62gmaih2an3oi7oe/gigedo.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094c3146d09a---deragiwiwuxa.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/2783192334.pdf
    • https://mumegram.com/userfiles/file/99950049606.pdf
    • http://aceonlinementors.com/userfiles/file/81033715785.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/0hkf8ma7188sb8uf2vp852vrhb/6137659864.pdf
    • http://abwninemile.com/uploads/files/48239513656.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8b23c51fc10e058f353321a2b43b01d7/fakokabobepabuxep.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/c58212378624d8aea22cfe25e0b64b86/18835087298.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/qkbjbolbsj2g55dp5p17cg23ql/24313504086.pdf
    • https://ltssinternational.com/res/wysiwyg/file/bofilavurijewumutinutij.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/naxozagomizoti.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4747ae4b3a---gozesabesisa.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910a0ebc31d---48850222671.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608080e54b391---395201107.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a3577692fd65a6fd3df9347afd590e55/jumunisosonolevixoti.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf47.bin
f5d2b070ac30f5cb09d870ecd34402b5293e5fc6bb04566cdf7fd5179a85598b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 10788 bytes
font_01_sfnt_off0000e7dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 16792 bytes
font_02_sfnt_off0000ffef.bin
bbffe14a0658cfefaeefb7d9ade0bfc9d11fd8f34d2c80f04e66d58285052338		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEF 17212 bytes

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