Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c9247df86fd893…

MALICIOUS

PDF

87.5 KB Created: 2021-09-05 23:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c85e383404e665d04252fd4a7d872097 SHA-1: 8734c5bd963c0956a66f9551375799fbf9a87fad SHA-256: f1c9247df86fd893d345a36a8e9f6b6ede4d7b62426d7f7e66a26624f9f82fab
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggest a phishing or malware distribution scheme. The ML classifier's high confidence score supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://chickendaylacrescenta.com/uploads/files/mapuwidibufufipusibexixom.pdf In PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/fenemazetawutuxo.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/6900404373.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a0e3d519f66193722bf4313d9abbf52b/61568268492.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612dfb319a500---xunesowikubilemef.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/s7csarb6mpi10635eogirdtcec/78681746708.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f0056b83---kopobosojilusenasogofuf.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607548d230818---gofasasopilebolutixategiv.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/03b60c121c75b90dc7a002e04c7bb678/vadipoluxuxivo.pdfIn PDF document text
    • http://yjccnc.com/upload/files/sodigepoxo.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/78293663138.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757afa15d3d---38477312021.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/51159927276.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fsmhbak6fd641sa2n617bqq8fn/xikudabivovetukulewa.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/jamozur.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/refabudikuzulitaxanoj.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/pevufetoliju.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e461e85ca47---nigexukalodev.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa7a3c9c78---zadewirusinixenededifamog.pdfIn PDF document text
    • http://placc.info/up_image/sowawodanov.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607539faa4301---71983305916.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/478f5e9c7d645cd55a3f76ec408ec372/8184718065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+remove+text+watermarkPDF 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_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 18032 bytes
SHA-256: f2d2ab37e3bd8482ec56ca39de310d45be5ed8e6ff7cafb3865ccbb62ce2719b
font_01_sfnt_off00012083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12083 10452 bytes
SHA-256: afc85018ccaa325a4b4fb3536054f6f6ca078a60c22859aa337cca6cbf41e6d1
font_02_sfnt_off00013861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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