Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a7205212fb0a3a…

MALICIOUS

PDF

90.7 KB Created: 2021-09-14 13:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 009ae6d7712f5bf67c259c43dbb2a0d8 SHA-1: 5f101a8a808bcf8f4f8e0cbb135e0039c034137d SHA-256: c6a7205212fb0a3ae4eb2795ec8ab40d2a4fa4203a3a88f136a695fd54efec41
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous embedded URLs, many of which are unknown or on suspicious domains, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/sisovebitizeme.pdf In PDF document text
    • https://speedwayinfo.hu/uploads/file/48660662132.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/34890701743.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/eu8meladssdg2lqgmuo00kge85/40722530590.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/wepizev.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/geperasabixu.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/86705240162.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/ganatigageselowelabali.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/daginigam.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/30764457936.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109031153293297.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/56774297227.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/5872156729.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/75427905390.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/rovivijo.pdfIn PDF document text
    • http://geose.ru/userfiles/file/49869312412.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/gazivazuxilusuvo.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/4i55qn929nf9vuihmu7pakrcsv/19669914964.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/54700224413.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/bovedigizagotenup.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/fapanubor.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/g4jclgr8nnb0bam1dlsatmk6i6/31757732898.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/pasisepujafajipawejep.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/xujifasuvufokijebes.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090402254835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=phantom+of+the+opera+novel+pdfPDF link annotation
    • 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_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 10572 bytes
SHA-256: 3eec173deb72a0f9c9d49ad0f84ab9d9857fd1349a82a7648e645a1589d7cdaf
font_01_sfnt_off000113cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CF 19064 bytes
SHA-256: a5ec4e6e20033352b3a3742d8401f0db0f4f0d7008641065dd001677f560aa35
font_02_sfnt_off00014544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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