Malicious PDF — malware analysis report

Static analysis result for SHA-256 67031a3a34be8f31…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 16:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3b9533561c4d7a12cd1d017a9d64358f SHA-1: 48f350e65de9d5b831eefb041cebea424fcaa9e0 SHA-256: 67031a3a34be8f312a1ec621e76b28c42fe8dbce77129faa859cab5876cd55f5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of `utm_term` parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://cructi.ru/uplcv?utm_term=earn+to+die+2012+apk PDF link annotation
    • https://ostrichpharmaceuticals.com/userfiles/file/63136787963.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/40104423251.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/36192353580.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/da655913223c9b8d9adc7f88ab43f9ac/40649684527.pdfIn PDF document text
    • http://ymmicro.com/files/files/mokejar.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/fupuxuxozikigasotedevevu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371beaf14a6---xanogopuxodofitazij.pdfIn PDF document text
    • https://almavilag.hu/files/files/lojujotiwexemosimabo.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/tefukesisutipidaworutaz.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/vorepeden.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6177cbc1b---61952979534.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/dipil.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405e64bb02c---70450185055.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/tefirexulogofometazovur.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/14363965751.pdfIn PDF document text
    • http://torgoborud.org/images/file/kiwifatilan.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210905084813778.pdfIn PDF document text
    • http://www.puhito.hu/uploads/tifuguzefonisatife.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109151920413588.pdfIn PDF document text
    • http://melvin.cz/data/35005728695.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/1367015600.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/kugutuvotujuwawidi.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/kafosuvelobojaxopalip.pdfIn PDF document text
    • http://4rrecycle.com/files/file/87991165489.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/mobifaf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC910 10540 bytes
SHA-256: d2638c878304b8974a0d24e2f0225b34e3e0e14ac6efeb6fc5a5364fbe5e8829
font_01_sfnt_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 16164 bytes
SHA-256: a29b536ab701e0f3a4d03943dd56dd4ec8b8c0d8b29b8e28b2448b9bd76a7e77
font_02_sfnt_off0000f6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 19888 bytes
SHA-256: c2c254cec4993c4038d094d1bdacdb0f980550db03789201392e51713bad6a75

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