Malicious PDF — malware analysis report

Static analysis result for SHA-256 de77dcbfd4f8deeb…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 23:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b67125a8cb1851f3d4f816c176520ff7 SHA-1: 5a15ad9b3a6e9ad46e089cd3c58410182dd3e1c9 SHA-256: de77dcbfd4f8deeb17dc25d44fa58a7d6112ebbfe082634e77a01946d75215ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or redirection scheme. The presence of multiple external URIs and link farms on disposable or compromised hosting reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://cructi.ru/uplcv?utm_term=how+do+i+cancel+my+ps4+plus+subscription PDF link annotation
    • http://hightopeducation.com/cms_uploaded/file/78914039002.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/34898229503.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/vojolewajuwafimovexin.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/84769664046.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/ripizudesuwuduroj.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/7743610668.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/jidizune.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/98714066877.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/37480033670.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ltmvk912nhq73kco1nqlonfr6t/xavakujojuxuvejemusama.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210915185420.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/ginusepus.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/bajuzosi.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/28684511252.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/pezometizenarusul.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/xalarigijovorewujimu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d25ce17ffc---66860409081.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20211001015226.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ijelel4646ebung49m3rnm7p16/tajizeju.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/58191618663.pdfIn PDF document text
    • http://cochemical.com/upload/files/jedejuzuxusatizog.pdfIn PDF document text
    • http://cpils.com/userfiles/file/32972437338.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d4da504b63---wuvifixemor.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/jafataze.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/bizufanosas.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_off0000b18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A3 11184 bytes
SHA-256: 0398bea009af263a75978401b3865cf8dd9eddd72ddf8eb0b57f56e17c72a0f3
font_02_sfnt_off0000e395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 14624 bytes
SHA-256: 74e125fb9dc5630bb52aaff9b72aa9c9f449e2c5810a1f35056ad18fe7bd3e50

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