Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40e65e0319325d2…

MALICIOUS

PDF

76.8 KB Created: 2021-09-02 16:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cee376ba8f2de42c1bb24e0f6ec4d898 SHA-1: e0e21b1d015a4654c91faa2966b6e1213602abd1 SHA-256: e40e65e0319325d29058af7ff73d95665646dcc7c82b208047070b412aa92701
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing multiple links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm for phishing or malware distribution. ClamAV detected it as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/d6aa2cdb708c52e55d06d6929ca5cd93/xawedudovudejidigalubin.pdf In PDF document text
    • http://cobmedia.hu/include/12353456029.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/bea0f0215f1e3d5b6f66605417ca8a43/68036801450.pdfIn PDF document text
    • http://ktcz.eu/files/files/vagamevokoribela.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/rivowaralu.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/21100487623.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a7381067---dujivum.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/89182789262.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/59763539268.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b502c0440---zotofabiwo.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/xubimoworejobil.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/uvlffupkr50m282q4n31qig1mj/22937083541.pdfIn PDF document text
    • https://btegypt.com/file/95607064704.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e7e6f1f79a76e24b83a1401ee9adfe57/refodekesukowosave.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/35690694481.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/uadd9n2hm3kvarelg3g8041ner/96304386691.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/f9t89h0nm9edjqqfmml7rhlo2o/10949858394.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/17844896927.pdfIn PDF document text
    • https://safecampus.in/cmsCart//upload/file/4265214170.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608551ccd4bfa---togufapupinotapavudomisag.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/84526995396.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/eim6ga6cnb4hqdoorouurvqof7/92725427640.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/kawizerefiderazudu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ef0f8rcdiphheuh8rjiilrd0a5/98809322325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=excel+mail+merge+to+fillable+pdfPDF 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_off0000c81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81D 17240 bytes
SHA-256: 3595772188b9e994c00283663477c3471b64b7e3862106e6e8580f6f976623b4
font_01_sfnt_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CED 10916 bytes
SHA-256: 79655e8e3fff08d35b751aaefe6a5e19b74eb6f3a63eaf8bc75c2807343c5568

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