Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a791043c0ea15f…

MALICIOUS

PDF

69.8 KB Created: 2021-10-03 10:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d944a8328f3e95a648b7d52a23bf0d1f SHA-1: 40113d0a7720c3a6650f81442a1239dacba8b7ba SHA-256: 73a791043c0ea15f4fedef1a7a37d8f992338e83c1b172c3db82ddf3ee352a3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.trisad.kz/ckfinder/userfiles/files/roxufuxujumekozipuzube.pdf In PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/83100633947.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/roromi.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/17802037945.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/98673287897.pdfIn PDF document text
    • https://pt-olympus.com/contents/files/nevizivulu.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/44885177465.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/duvumimeguworuzawufun.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/35270560745.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/wumuzomiwewo.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/63834298397.pdfIn PDF document text
    • http://retailjewellerindiaawards.com/userfiles/file/37148717976.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/40934529675.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/091113458373.pdfIn PDF document text
    • http://chinalabware.es/d/files/99762840050.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16143361ae810b---64233178694.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/28654793995.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a25dba8ff698c19179dc61fae309b29f/semewiwubakiwekuzexid.pdfIn PDF document text
    • https://tobikam.com/userfiles/file/votinibegorafamag.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/kapevunizutejig.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe9e64e50a---kigojowezixifukeluzekovev.pdfIn PDF document text
    • http://agilesolutions.in/uploads/luzixu.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/43226824324.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/34507015981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=wto+articles+pdfPDF 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_off0000b1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AF 10500 bytes
SHA-256: a9451ef8f889e951e93b3eb01724fad4afb0c38c2c60e7c92d2d4f6b0a9b5b70
font_01_sfnt_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 15804 bytes
SHA-256: 54c76f767241bbdc70abb5abe92712b5444abe8dd2f93df04267fda985f947c6

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