Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77be18174b48d5d…

MALICIOUS

PDF

87.1 KB Created: 2021-09-08 02:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ec1f16ae259ccb2e8ef53cf16203b37 SHA-1: 2b6f3e6110e89f1f337fd8f25485d6ec4c11ab05 SHA-256: e77be18174b48d5d9c17a9e1a5954f6a414665659fc8bec22f79801b37a1558a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ec57933b44e6f63b81f20ac5ceff2070/95544208359.pdf In PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/88698739490.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/sovavedubekinuwuta.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/516a79265f1d7574f6a37ce6630b83ce/vizonafijelofarojasat.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf8408c69---96841177060.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/buxifavojapazak.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093e61fb04e2---fobonevoxupovese.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/gapedoxe.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/kalafezezafam.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b232615cf65---nanonavejuvogexofebexedel.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/921372402.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5bf69466---sazufezi.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/defujotepodaj.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/bigizikowixatezosutog.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/pv86r8tdoi559ta3l2o69t99fc/numudijiwe.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1623950221.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127427237cd0---72292112401.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/bosebidedejagubitur.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c29a6a31c1---925738899.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/1089534257.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/jnonn7oubke3um48dlvqk8hg16/49883781554.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/69205739705.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/ba319ee2c3c07238076f2396d53c746a/67617156124.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/37f3a0fed620578e84b804fd2d9f5de6/voloxutabedudedofuzuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=biological+hazards+in+laboratory+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_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 17580 bytes
SHA-256: 0d6423cc5dda9574d69c112ed6f8eadc24965d6ec5332b09da7bc5ed89a32183
font_01_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 11136 bytes
SHA-256: 09f7c389f1a22a6d1e3b3870b1c2861cdd18096d197045796f7461227667d576
font_02_sfnt_off000136d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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