Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e92a943f051220…

MALICIOUS

PDF

86.6 KB Created: 2021-06-30 15:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 935a3f2ecae6528c8dc30fc84c3cc440 SHA-1: 6b620b7cce371cf077c28d0e3b2834a014c159cf SHA-256: 35e92a943f0512200fdaab48fcf01257c858f9e73c2312dcab50062c94d1d959
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to compromised WordPress sites and other disposable hosting. The primary attack pattern involves luring users to these external sites, which are likely used for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://crewmak.ru/uplcv?utm_term=five+letter+word+with+y
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/b74b9d571cd44620f6642567a16a34ef/rurugigasir.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc25cfc8772---wanodibosamu.pdf
    • https://eyetracking.pl/userfiles/file/wumowaderegox.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc16364073---64410139210.pdf
    • https://anmimar.com/royal/userfiles/file/84987589930.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/nlluoen6fbvctm8kpk3p82aro1/6476043083.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/99c427e3869b60521f6cb6cde0c7db86/16140040159.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe9bb25564---46575689745.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/ba7f981d669f822165e3bf7451dabb9e/18276534059.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39b163caf---64911154132.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794553bf7ae---nugotuleji.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d865944fc8d---jugoxekorovasufu.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160caa9e3ce981---24956583896.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc3842876---9844234322.pdf
    • http://studiobardinisrl.com/userfiles/files/rujatufamekidarugu.pdf
    • https://solener.info/ckfinder/userfiles/files/18741211531.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160748dca5af53---58925400098.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0780e1d28e---48852637846.pdf
    • http://prtourusa.com/FileData/ckfinder/files/20210629_A56806264A73E6B8.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096098b2175b---90442130427.pdf
    • http://bioscipublisher.com/files/upfiles/file/kivevuwogijevijemegew.pdf
    • http://cnpair.com/userfiles/file/20099917397.pdf
    • http://eko-inwest.eu/upload/file/juvojakusi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f212.bin
bc8848808ce169394e31a9260bb10c1588904f56a4ba2f100ff3e716525354d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 17144 bytes
font_01_sfnt_off00011ebc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 16792 bytes
font_02_sfnt_off000136d3.bin
9dd96506e611e25d5a9431e8f25ff3ee59b682ebad526cdf7fc4e761f2462a48
pdf-font-stream PDF embedded font (sfnt) at offset 0x136D3 10156 bytes