Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d884bdc0e3469d…

MALICIOUS

PDF

77.4 KB Created: 2021-10-13 20:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 404c11a494f3a8cb87f1cafeb756791b SHA-1: 2fd237557a1703f09d7a3f9d534be0b043d4b375 SHA-256: 10d884bdc0e3469d0d784ee872165fb6bf30796ba52e0fd7ed6b8d5b480f56c8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the overall structure strongly indicate an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://psycare-spb.com/userfiles/file/58159692836.pdf In PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/jupibexuz.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/newisizaniguvori.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/77978848383.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/88463893835.pdfIn PDF document text
    • http://skisun.it/userfiles/files/begojazikabesezasotavo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614086d767905---9345493018.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/tixazinisupin.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/53653056591.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/kexukexelaromusotop.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/1028230964.pdfIn PDF document text
    • http://vkts.se/userfiles/file/99437050498.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/47535670175.pdfIn PDF document text
    • http://siltukai.lt/userfiles/file/10643569148.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/xakemiranodotu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16165f7ffcf49d---83540660777.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/6793c4d65a7f3d939b830eb35fa2bc90/31574014512.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/22083176015.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/19294851684.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/numanepexutebe.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/14233098327.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/39183565412.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/86096437245.pdfIn PDF document text
    • https://akemi.ro/hirek/file/lobolaj.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TSvcnjQ06Jg/uplcv?utm_term=how+to+get+your+dog+to+be+quiet+in+his+cratePDF 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_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 11180 bytes
SHA-256: d5774bb6a0d320d71273eed48f96bf853bb33c381e823cae61874c6e5935b365
font_02_sfnt_off0000fbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC3 16868 bytes
SHA-256: c75362779e76b65ff76a9961672c9d4c95d143171a0c7de8fed614dc5b3cbbdc