Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d934ea078ac27e…

MALICIOUS

PDF

91.1 KB Created: 2021-08-06 08:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 25dc20be6527bea8027943fc3cd4018f SHA-1: 3624bb11d6016abf173c98f9979380a094f119c0 SHA-256: c4d934ea078ac27e84f79e9f4a0d6a44af2c8c84777a43bcb6e463d4428c2a94
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as a phishing trojan. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crewmak.ru/uplcv?utm_term=keto+diet+grocery+list+printable+pdf PDF link annotation
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6c2bac1bb---turivusezeb.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/ranojasen.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kulidurosonegujegefijaw.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/18417316260.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/betonulajexaluzifepasud.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/dulirobedamabopen.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/789632332f5a792ce4fef4bcea02c52a/janiv.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/sc767b2e30ua1etk70aqbu29e2/boxibodimu.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/9712586159.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/musugonivudepupololaxufum.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2f971002b64da13421c74279be7722eb/bokupidapujurunumipex.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/xavizap.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/56774692835.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a6285987e52---94089092784.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f24f5de574b---raxax.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094bddf87630---nesotifo.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/277ef5b83a0fd4ce2d465c751b815834/28890365620.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ks2doeol4vndr5a0nkbhbcprfu/27319185942.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a758428fe25---59504843029.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5169d1d4a0---nedosirixig.pdfIn PDF document text
    • http://alptw.com/images/files/12702562201.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/39501082373.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/86649748893.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/gojesidujesadebunexapolu.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/678d41a7205f29950ec248b52d98f7f1/nipovudipeduxiko.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_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FD 11040 bytes
SHA-256: 224b85773b262869eef679bfbc37164f05021686bced66ad5aea9388fc3a74e2
font_02_sfnt_off00012f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F61 17300 bytes
SHA-256: bd199004540568968a23f06a9fd55c09b732a96c6c65adc12cb879617f40cb9f