Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1fc97fa0d605b2…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 11:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f7547cfc07024a08d362f59f90e6c98e SHA-1: 57d819b297b3e367726c2fe015b2540f0efadec6 SHA-256: ec1fc97fa0d605b2984b93228d1fbe5a42b3e7bea721be56524da6d69bf7ca97
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to external, potentially malicious, sites through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://coretry.ru/uplcv?utm_term=place+in+marketing+mix+example PDF link annotation
    • http://www.deewanalarab.com/up_imgs/zegavogodigawedip.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/dovosele.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/jizeduwujulujesazokanovof.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/50603585082.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/vofugajavigugifejifet.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/54244925827.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/wulilitexinitafoli.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/rizixag.pdfIn PDF document text
    • https://nuteuit.ro/ckfinder/userfiles/files/15788426755.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/lewabofakixotiso.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136155ec4e5e---1985044487.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/zapop.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/90534064376.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/42791134537.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/38164908547.pdfIn PDF document text
    • http://seamacros.com/upload/file/46697192898.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210911072919_OTUwMzU0NDcxNzI=.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/78694479736.pdfIn PDF document text
    • http://tano-cable.com/d/files/patexegiditexe.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16156617f23c5c---zebopilaxi.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/velabered.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/15169870700.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/673e8744689f9aab184250de7580560a/wuzuriri.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/g0ncnv1prp57o9bvnf7gidoa1o/gojotubopawubikadazal.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109121945426190.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/mejede.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_off0000b168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB168 15128 bytes
SHA-256: b0349546dd23708e12bee977b3810fcbb0a7c59209853d085106fd71f80b97eb
font_01_sfnt_off0000d6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D5 10624 bytes
SHA-256: 98058e47e1fca271edcb2d3a661209e6d8436f3ca09783d020cd7b249397b0d1
font_02_sfnt_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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