Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c19087b6749f5fa…

MALICIOUS

PDF

98.1 KB Created: 2021-07-19 21:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 123a6e7457fefb50d6bed168a2c0319b SHA-1: 08e575a1b4838609b2f7ed3790bd3e6155558d15 SHA-256: 2c19087b6749f5fa0585d7ed0779d9db8a64eabc61c37d10840c5073dbfe427a
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 WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aebd30a5cbc---67030356531.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7a7d5f47c553e9e5fcbf326cbf289207/wetupijabataputajizowemi.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/kuzumuxifebi.pdfIn PDF document text
    • https://clinicscrm.com/img/files/lokajam.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/c0t7fecm610smmcltci9bodl8b/62772317021.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/8283063749.pdfIn PDF document text
    • https://gangnampools.com/contents//files/22436884809.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa33818c0---34151899161.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/41312587849.pdfIn PDF document text
    • https://foulardfotografando.it/file/jobonedaguwozabopalas.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea11ed6d4f---51081429191.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/09v9rqe1s3vmj8rl5iin23rqq3/ranivasezesegafimu.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5359399484b2718a7c72f343aaa0877e/84196083659.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dfpaspsc8jb6n9vssbmrdgnj28/90097459332.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e903a705a12---94266221266.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16d3c912c---xoxeripulebefuluwojujafo.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c96ad5013a---pifugitipupipu.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7bab739e04fb5b7278412bee66e9a0d6/95420255599.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21b9ce645b---fofikobije.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/renujavuvalelapotuxopuvu.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/vomobefura.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/5vqkngipr795jffm73ou3c7lei/21601057420.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/6982d117999646ac373190d1e90bb59d/kukog.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a26037ca2---rodanakuxozovufuganum.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607573caacb14---kubotedomitekumesezozud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=company+of+heroes+opposing+fronts+manualPDF 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_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6A 11048 bytes
SHA-256: f0e54a05879b1df380b95284e7502a65a8a56b88e0a6b69b1724dab43be1eb06
font_02_sfnt_off000145ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FF 20180 bytes
SHA-256: 2b87e2cb040ed5f6f40877370ce45fd7420e94c7e4f46f925f8a87512f0aa365

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