Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8ae46339164963…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 07:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9277b7e7950e5aca3f4298f2617d9498 SHA-1: d9d29abf1012fda8d4cf5e199530425a78b63ebc SHA-256: 6f8ae46339164963b10cf58943fc60050e610bb2ce505123fdec95958e55031c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point to a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613491a4c04e7---vofajemolipokojomemovapu.pdf In PDF document text
    • http://kanomax-nsk.ru/images/kibekexezuwewunuleva.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/47744638664.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/92083346905.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/xodozijetuwotemer.pdfIn PDF document text
    • https://rajaunited.com/contents/files/pokuvip.pdfIn PDF document text
    • https://led7.ru/file/bufufegudivelonasaxur.pdfIn PDF document text
    • http://showdoimovel.com/files/files/69019578446.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/43661139197.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/xifepamerenedonobabogibuz.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/dogin.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161374c2d8eb2e---78603583121.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/retow.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/775cb56ec9b101781a4f96492b9960f9/5391168669.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/46064178598.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/43088005037.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/15180622127.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/fowiwosebinidifutatonad.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/805969649.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/sivafom.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/40378891827.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/50276335806.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/63806412806.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec4b252d7---25179410637.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/vilupekimozufij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mathematics+for+machine+learning+marc+peter+deisenroth+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_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 17940 bytes
SHA-256: c855f0fb2159f3d3326f9d6873dd00c6bc6710462980ae063d430c399c9bba34
font_01_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 11060 bytes
SHA-256: ec856bbcd7fe5b9a92ab890269bee2ca07c60a685dc087c39ebfc27954fbe282
font_02_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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