Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9963cad2f2f123…

MALICIOUS

PDF

99.4 KB Created: 2021-09-08 06:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d2ee487a536add192188ca161df6331 SHA-1: 97ba77a6aea3c1f54711bdfe4d055870b7c59561 SHA-256: 4a9963cad2f2f12373fc46f8a9ba125c6033bc31d503f781d7accf2100ccab1a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing malicious content through SEO-poisoned links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=tourism+in+sri+lanka+pdf PDF link annotation
    • https://www.rougeindigo.com/ckfinder/userfiles/files/gekodarekaxokunofokotuzar.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021061114373573499.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9f152563---9061244424.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/43402373057.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/21802281309.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/32855975906.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba467188924---tugipesawo.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/xekelifevitewokufiwa.pdfIn PDF document text
    • https://kar360.com/resimler/files/21216894163.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/43287866090.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4c9ac46c6---53146107610.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/satejinamakuv.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/gubox.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/61337893729.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/legazipusilinenimo.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/mepubomadujolu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121769976936---54064893525.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/81906735086.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/gerimer.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/somazegudakijo.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/dukejajirogutopi.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/79022545955.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/koxiwiderudexevenigusixaf.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/59886269662.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/62684348351.pdfIn PDF document text
    • 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_off00011beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FD 19864 bytes
SHA-256: 953e3892865ed5160fea9449f28d9384f67f08e22077c2ebda1b27f35781e816
font_02_sfnt_off000167a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A5 10584 bytes
SHA-256: a7f685997dd06e4d7e450030ed8e1dd71b2251c1b7ed030684deb3053940fd4e

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