Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c16811ff51e0abf…

MALICIOUS

PDF

86.3 KB Created: 2021-09-21 03:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 21615f42aed505669f7e3252c0360c9b SHA-1: f787a09a258d6432c06c2f1adf5a563ef3fb95ac SHA-256: 7c16811ff51e0abf7a03f0afe7101cf14c395fc79bc617e58065af21715e72d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including one hosted on a compromised WordPress upload directory. The primary purpose appears to be directing users to potentially malicious content through a series of redirects and compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://stevis.cz/files/file/8517571882.pdf In PDF document text
    • https://itexpertdog.com/upload/files/81474898173.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/tupexanirenukimuk.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/joranuleturazifunufa.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4a3c8ca70ad8708819e07de5b65337c2/jizitijojeraxijudila.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/zoluzagefiburobujopuxefer.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133376bda6dd---jojexexajexagupazijabe.pdfIn PDF document text
    • http://kmsenior.org/file/files/tukodezekapurilak.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/bemujawijanetefitimafat.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/tiwumebonutufeluxovawe.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/97868017484.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d3a0b98a1---zivomelazutujisusozabolo.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/90e8be931cb066aec881b084405482f1/87254148055.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/93307010346.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/xedupemiponefifusedi.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/namekidedug.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/rewabedokenoganajeriwufi.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/890550656.pdfIn PDF document text
    • https://masihpt1.com/contents/files/zepebixakizako.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16139da661cb11---militexudagiwimulakivaj.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/52889892517.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/ramupunobalewimuxo.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/23866258244.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/vijubebuditotubebizu.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/c63c1658018752a0dac318ca348a1688/xorelutujufilulonajenofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sign+out+of+android+phonePDF 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_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 10740 bytes
SHA-256: 0ed763e87c1403d105462ca01e450c39577d8852893329b7df4f15826a07a526
font_02_sfnt_off00011d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 17620 bytes
SHA-256: 3c7b46e52a5fee00dd3a637e40f3e1f0c11676a795d92be8a8d492ed6d37b4d6

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