Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad93e997df8f0f0e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-27 11:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 016badb15581af59367a28ebce2fbc9f SHA-1: d738bab795fe4533579c9a97c6b15d017770ef4d SHA-256: ad93e997df8f0f0ecc315550558c6bfff609072683479b75a94f523e481b5544
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. The presence of numerous unknown URLs suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/d15de0e7a7e8daad58dfc3e7ae26eb34/9357094294.pdf In PDF document text
    • https://btsis.com/upload/ckfinder/files/jizovalubugu.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/pitazikin.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/62594091328.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/20248882406.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/zuxonanikorav.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109210231354189.pdfIn PDF document text
    • http://gewald.ru/content/Files/70178778301.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4dc093a41---50903381360.pdfIn PDF document text
    • http://scpt.it/userfiles/files/49755229992.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/64695601633.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/41223806134.pdfIn PDF document text
    • http://salt17.com/userfiles/files/tixagosapaxosa.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/34480259093.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/felabuxoz.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/nefegekalomomufuvotavari.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465e70641c1---94293543835.pdfIn PDF document text
    • https://tckontrola.hr/files/furoduvejijuwu.pdfIn PDF document text
    • https://electroagro.es/pub/files/9026564646.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/bokojuzajogoxovefasinujep.pdfIn PDF document text
    • http://contua.org/userfiles/file/valaw.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/jabazaforalabuwusofemitob.pdfIn PDF document text
    • http://caramelitos.sk/files/24064743886.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/91616660020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=neo+geo+emulator+with+all+roms+for+pcPDF 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_off0000b340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB340 16504 bytes
SHA-256: c2e9aaa0200ad62ee6c0a893591b239c6d96cbf00c0dead323f8d14fecdd8b1f
font_01_sfnt_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 10984 bytes
SHA-256: 861a66f147cc7a07cc065531dd6990186bcb1b1d2ff5fe2c422be1513d04ab61
font_02_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1