Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de1c5b604ce491d…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 23:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a21cf1a2ecb489245f8c4d3784178777 SHA-1: 977e9c8c01b7e405a2f677f65fc450ce618ec673 SHA-256: 1de1c5b604ce491d24f9151ed3fc8818d872227d81b9582c8d8f10c78ef10bc1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The embedded URLs and the overall structure suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=toyota+avanza+veloz+manual+2016 PDF link annotation
    • http://dreamwith.gni.kr/ckupload/files/46634220212.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/82205823762.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/xilotamolofelesenokujur.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/gunege.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/67a7e3fb5a740d4ebe9a38d05495bd9e/29907521477.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/5a8ca6da1a2043fdb71ab3bbeac48cc1/11705680765.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/4286373309.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/be8e190dfbe8c7f6c59f98382bb73dbe/vadujadinajipe.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/40439636684.pdfIn PDF document text
    • https://2acontractor.it/images/file/14379628692.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/84531255279.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/rotanafuwujixiweva.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/vixunikukixufad.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/betelurebe.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/babujoref.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161237616a9016---45768896362.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/68755537896.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/3e6e6e9054cc47edfdad166b60be42fc/norufun.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/gexijufipepezukoda.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/vopanuvexexadefufogix.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/27b0c6e578ce7110b984ecedcdd2872e/25037061165.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/rapomepirovuwalofamali.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/96578534831.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/dkueoe1ne5ccn4qnf1vqeff4fc/wekaxodivavokatovafitaziv.pdfIn PDF document text
    • http://mldinsaat.com/image/files/lofejowulotubakora.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_off0000c2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FE 10676 bytes
SHA-256: 4422d8d9cc7df7afa4e419f588b8fee630c843e779bd66619c37a6ec53c85195
font_01_sfnt_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 18084 bytes
SHA-256: 5a002708792181887d53cfe6ae90cf8dec87bce17d1752192c4ed12cefbd27c6