Malicious PDF — malware analysis report

Static analysis result for SHA-256 9869b72851a8ff77…

MALICIOUS

PDF

110.8 KB Created: 2021-07-13 21:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4bf5253c76adcb35702e23b1068cb825 SHA-1: 2266b30d0cd34f357b0e5f9604ce95fcb6bdc253 SHA-256: 9869b72851a8ff77eee32e366a1cdb0d121fdd78ef555643c5d3477ef859c954
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely to host phishing content or further malware. The PDF structure and embedded links suggest an attempt to lure users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=brown+and+yule+discourse+analysis PDF link annotation
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/gvkg769u0v1o8bvhn7gnhqkffo/moxesutitinavetawokav.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/kegogejororijo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5d1e68215---jalanomovefaj.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/40641265250.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/49123780479.pdfIn PDF document text
    • http://asfalon.com/__files/file/loxinumulomidumuzejupe.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/63501254960.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/228d46894841725b27cca96cd93c77a9/13575540611.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c64a070ca64---82877513034.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/1eqafsjstenlr5qedvom7trij3/67673097279.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9e8b30f0141524bd9ed3ec878ad20ca9/86269374979.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be3e6cb561f---daviwa.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/60f4490dec7836e6778f8a880a204735/65746270935.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/8927ebf4c6ba3170757d3d89691d2a41/43108558701.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16087f946d4539---petetogale.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/sesibog.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608081e7e54b3---togata.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/jixeperugobudomatodoviv.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ba1204d9e---kipuxiw.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/mojagapanobati.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/56632392177.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a594fbbc02b---67682075848.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/tovun.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/93877920365.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_off00014a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A91 18636 bytes
SHA-256: 359597286c1c1c57e7cb23fc6ffee9cb6f1e810b0f48d2297f733050c59a4fce
font_01_sfnt_off00017be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000193f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193F8 10620 bytes
SHA-256: bdc61402effc35a60f88f45e480ec1d364c2d2a1e5b517814cfb25036dd7f3ff

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