Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac92a5035f21d56…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 02:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea184a1adbb02f72d74d379797ae8519 SHA-1: 348e7a2a89687fcfca6efa41b1c8ff67e625da3c SHA-256: dac92a5035f21d5684d8b7ecf327c8d77986af4201b012f9287cae505f395b34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://njchemland.com/upload/files/werevefu.pdf In PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/pobafixafisavosaviwi.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/riwewoxofenejana.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/55493084021.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/litudojaruzosonaxavezavov.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613244ce1d364---sudilevibafijenurupanazu.pdfIn PDF document text
    • http://linza-market.ru/upload/files/76619407182.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/jumetolujijofapub.pdfIn PDF document text
    • http://belean.pl/userfiles/file/sivabesoju.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbc5928eba---54927539089.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/99067966101.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/92071155751.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/40182728235.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ddd442cf1---dejazizejoxovumedugumazo.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/27815149448.pdfIn PDF document text
    • https://tch.lu/files/files/loxidejadobor.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/56030898800.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/lumexofuboxowizojugag.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/91179215576.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/zepupakiwa.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/954889415.pdfIn PDF document text
    • http://erpos.sk/data/files/48432988861.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/nakatorubexatoxonebifebot.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/11865374580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=123movies+free+downloaderPDF 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_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 10816 bytes
SHA-256: 0d26f3981a948a56a1189d9ae46b58b69d254ffec939731975c16275d52bf886
font_01_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 17396 bytes
SHA-256: 58e0a3eff06f701798837399a9dfbc28ac9c4ba673fe9e72cd0743ddeb8305f9

Open this report in the interactive analyzer, or submit your own file for analysis.