Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5df40e79c83d55a…

MALICIOUS

PDF

84.5 KB Created: 2021-07-13 22:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2c102e59e076cd7ba4b3c2c4f4f650e6 SHA-1: b4dce873a14ffb0dfecac994381a7fba5aa1cbe5 SHA-256: f5df40e79c83d55a34e39e307e948c40b002147c86c8f2e6257355b31c7c7a09
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=simile+for+smell+of+food PDF link annotation
    • http://yangs-ns.com/ckfinder/userfiles/files/20210607101608.pdfIn PDF document text
    • http://consade.com/userfiles/file/57348074399.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ahvqqfhch9ntbvjr09o65urttn/getanoxe.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d8c65871df21b30c6bbf7792f4ca397b/nagija.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/jcqt6fqk3snn7lq1uau4s6hn6t/malexudesibuzanibowawe.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/4279798748.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/parozedexej.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e782de19ff---36099590915.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae20fae90e---gojagowesaruzilipo.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/90972849713.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/11008024000.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/tulumadikikixatazamitid.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/09601cca4a40342378e47a7799fa5970/daneleginofex.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/38150053243.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/2422a410f32defba250802b60d2a6613/kisexiwanilesogobide.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b895dcdb77f---kevasoze.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa745589a---juruvulirenukeru.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/gunowinezimisemukadu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/74633668047.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2c2daec08688580392d3a9580a00dbba/13427488458.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wufokunusut.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608964e4942fc---xapokilunawowivoxup.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_off0000ea3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 10228 bytes
SHA-256: 8101d337963f8280573288ddaca0ac9df249c0ceda0e6c6ad8b8515156e890b3
font_01_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 17412 bytes
SHA-256: 16b4b65e4f20f61dfedfab274f7b93ed97610037a9884d26ce80f5e93a7cdfe6
font_02_sfnt_off00012e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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