Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b03652f45b2b722…

MALICIOUS

PDF

78.5 KB Created: 2021-09-09 09:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dcba7cdeb5d397f0ce5d8a99274b384e SHA-1: a5d4d4481c3367df6f3363f04421988dbdee2d7a SHA-256: 4b03652f45b2b7222cab34d8b68ba16e07f69511823a2b09a1f731fb82406ef9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dolnoslaskialarmsmogowy.pl/imgturysta/files/92030877023.pdf In PDF document text
    • http://energyexcess.com/userfiles/file/84665815235.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/gofikadebojizorewugu.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/dakexone.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/30049577293.pdfIn PDF document text
    • http://asvpp.fr/pdf/konimufejope.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/lufukulixeg.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/80734342014.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/zodirasodotu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613950df5b770---13443390970.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109022121026832.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139157471535---ralemefunefekizemivewo.pdfIn PDF document text
    • http://co-mit.com/uploads/files/53077642230.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/rezilatunelidob.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/377174bf5f7fa6ba427a16112666f3b4/93064558948.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/39624108362.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/24621473986.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/32675831698.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210906_B0106C462590A017.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/xekuxokekuseriwakutupumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=operation+management+sustainability+and+supply+chain+management+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_off0000cdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFD 16936 bytes
SHA-256: 63da939748a2887d2a1639411fff0ba9338f8a45d57e71bfb32946a6cefd43ca
font_01_sfnt_off0000f9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 11448 bytes
SHA-256: 7e737ea2d281b651bcea5f244882877dba8b936a7f38ba446f31803fe846b05e
font_02_sfnt_off00011422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1