Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0735e188dedfdb…

MALICIOUS

PDF

89.6 KB Created: 2021-09-03 06:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3cd852c05b7966a371063b309a29907 SHA-1: d09b5a73e8d2f274a0180f8905542936f419d74f SHA-256: ce0735e188dedfdb8ca0e1a3716c88cd6313b8d96583870eb603935c6088289f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://logistra.fr/ressource/site-image/files/rofugomuni.pdf In PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160badc8cb6e78---visediwimon.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/14409004417.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a36aa698b06---26465665467.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/46566552102.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2eea1a778---84379827821.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/dikidivu.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/rivuwo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607b74d051c3f---56175283661.pdfIn PDF document text
    • https://profesa.net/userFilesfile/92483592944.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/lewixofulewokugunota.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/1487950083.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/gevulimivupufirunelikigud.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/winako.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/90634486128.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084b81943665---tasopexajuputapetejes.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6543a16a9e7efe32603ec0411aab2733/kiriturar.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/84984900093.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/gqb0s4r535fgnj1pp2k7sjuea5/2280776660.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/a5b9cd87a3c5e6f60fe90be5ca585e38/49004718553.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/17062353307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=initramfs+fsck+manuallyPDF 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_off0000f688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9F 10504 bytes
SHA-256: fef4b0274cdf5ef7a7c50d2a4086cf6ac334835ef6b8f3d66fd02305809283b9
font_02_sfnt_off0001267b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267B 19284 bytes
SHA-256: 573979cc0b88c1b6fd42711855b05b447e7bf632c625f28192bc55f2bf9bd42f