Malicious PDF — malware analysis report

Static analysis result for SHA-256 3601b3c093fd3cc8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 03:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 89c28597207c49b648f746439e66230d SHA-1: 7a56702724cb38ca23a0bf9b66a055e4132cff0c SHA-256: 3601b3c093fd3cc818b92b5ba4082038ecf7043e2ebb345bd9df248d004dcd02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chcial.ru/uplcv?utm_term=multi+window+android+11 PDF link annotation
    • http://detskaoptika.cz/ckfinder/userfiles/files/gafek.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/bewijimupe.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/8616755413.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/70293895018.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/77779928819.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/46921559482.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/xigavukiluketifa.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0a6e4332a04fbb71886e613fb2ba9014/32916456224.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e316423149---sepowerawefetolo.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/kofekozapufenizagaw.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/vegomevuvafosine.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/95306394924.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/gazifuxuvesezakal.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/mepebanesuxoxakikisonida.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac80357606---20035548540.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/13958233211.pdfIn PDF document text
    • http://martonelektro.hu/files/file/sifajadigevadav.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff9f468b1---nipumilodukejugexidik.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/18168479946.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/66782574149.pdfIn PDF document text
    • https://slide-bearing.com/d/files/wadopelezixu.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/pusizexa.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/wedatakejoteje.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_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 17700 bytes
SHA-256: 3893e2f13e3cdacde611a361a9299a2285190f5512a821f322cab42ffa89ba37
font_01_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 10172 bytes
SHA-256: bb407eb3bb076d129c62dd9adf66e27861c87fb1f17ef5cdbffe3a827298b7bd
font_02_sfnt_off00011ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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