Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8b37f8e0c0dc3b…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 13:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ecc2595499cc7ef704a05f044560b1a8 SHA-1: d2f188ee98468bd551e646ee72deee5380fc9d8c SHA-256: dc8b37f8e0c0dc3bb3176833af4c7fe3f7dca519db745123e865918edd352b94
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 as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised or disposable domains, likely intended to redirect users to phishing sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=yellow+submarine+ukulele+tab+pdf PDF link annotation
    • http://gesht.ru/admin/ckfinder/userfiles/files/47409765162.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/32815364400.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072e2067e8f8---4167078073.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bd329e6be---71376711586.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/23112546607.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/93167973333.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7a2c07f31---39063674568.pdfIn PDF document text
    • http://sieuthibds.net/images/files/10892658434.pdfIn PDF document text
    • http://ping-property.com/user_img/files/6659821.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608741caabbda---76013210062.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/72455569453.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134658e9998b---6354418150.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8daaa1ff285f1c1fd3a0246397cbe85c/5515605876.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/be231cddd622b5b0c4c0dac4fab2da51/44258689099.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/gotusap.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/2104837881.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/kpvlf8vc7bmq16jhe12k36tc25/4889689378.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b122280027f---97958296883.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/panadaku.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612ce4a366685---40752734458.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/lunowutunibomedorukumaje.pdfIn PDF document text
    • http://le383.com/uploads/files/sogenuj.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/nowol.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/pofojudaguk.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_off0000c492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC492 11060 bytes
SHA-256: a824cfff1f62fc18cc0760bfe97c4457dbec429ccec1de2c0a26d3930bae11d6
font_01_sfnt_off0000de25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 17252 bytes
SHA-256: c1123cf6d30ca63485d37f88f735a32a0e5a2cf3610a957d116fb940153636ea

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