Malicious PDF — malware analysis report

Static analysis result for SHA-256 8808ee175e9f1939…

MALICIOUS

PDF

68.3 KB Created: 2021-09-22 22:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e525e20390c1e83048cd77ca2bbf2d38 SHA-1: 8605fb8b584e5a8476f8747a2337f3850a708e7f SHA-256: 8808ee175e9f1939962201d7425b1d473634d39ae5e4fe47eb581a943b03bc36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The presence of external URIs and a link farm suggests an attempt to redirect the user to a malicious download site, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=download+new+pipe+for+android PDF link annotation
    • https://dbjadow.pl/attachments/file/situlisokulixe.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a745fa17c1a378bc990ee224d2f58069/68103105630.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210911082132.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/mekunidol.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/92726964152.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/96385954027.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/zetelemazaxupalesebol.pdfIn PDF document text
    • http://palami.by/images/file/vumisutawulifob.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/sinasotetibojasi.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/jemujalovanizomapeborisu.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/54685889564.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/72592578689.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/95389428206.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/45728396720.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/07np3r75inr9ve1926s4ps2s7j/37906778250.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/54416335433.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/kexuvomuguxosob.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/vatujedafulotifivapo.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109101017459275.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/14184379193.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e1660943a---21169958866.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/kizunefudegebaximanu.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/gigufifawogozisag.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_off0000b000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC812 14272 bytes
SHA-256: 9ae589dd101bcf0f8d211acb08f2a060a6f8bbf332db33465d5e3b9435791467
font_02_sfnt_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 10312 bytes
SHA-256: 93dc32c4feea853ca6976c39c469f263ecb8420501cfcd4a11eb919c3df7fdb1