Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f036c8d20cc8fe…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 13:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f28fa9721e7e5dcc3c5dfcf18c3f469d SHA-1: 960dc678b21e09a6f034d88de4d48bcdff307f5a SHA-256: 20f036c8d20cc8fe66a033aa4a8d865390965ad8c6241e15478111834cfc4063
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the file being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/chhv164arj3c0470odhh6u13j3/dagebijivilewumobarigi.pdf In PDF document text
    • http://staresecurity.com/userfiles/file/dukigofebinaguruzi.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/86502917336.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210701051337_2029826213.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa879ceb8e---83769383073.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/wubofijowudokizujo.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/fusejajef.pdfIn PDF document text
    • https://temahr.hr/files/jotikakos.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/sawasajimadewitufozuz.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/63553722157.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/wuriki.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16102cebbed70d---32515856659.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9eacbff7e---66788028930.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6b5faa9767e023abad3a96081f3d4b81/rewavuworiwogapijamibite.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/16095946241.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160e14f23a1e1e---31205777922.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/81295579647.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/84104304801.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/jt24enfreuc5u12musuhkmpufq/jusag.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/67b5de0a935791e4f395f1d64713ec9c/lebarabomasonamavuledu.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/7ce7eef09beb1b3bc3c488336a12783a/sewujesin.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/tekogufilefajesipaworaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=assam+tet+syllabus+2019+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_off0000ea87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 18092 bytes
SHA-256: 347a99c1d61576871c879a8ac2ac9d64ee52e9e074234299b4d092fb45b9df68
font_01_sfnt_off00011978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001318f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 11040 bytes
SHA-256: 2274212790eaf77db8386eab7d580b9ece89169f258a9dad47b503f23936381d

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