Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8a24afae085c9c…

MALICIOUS

PDF

94.5 KB Created: 2021-09-19 08:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f5ebcff85cdeee54b4ccce85bbada1c SHA-1: 9d6b6f50d63ba1bab6878b16a8e844d6775e49ca SHA-256: fc8a24afae085c9cea0f53e6b051307fa93041d0c3b63417cf9c8d0d0e8285e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The PDF structure itself is also noted as potentially compromised, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=pathfinder+2e+bestiary+pdf+download PDF link annotation
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0db9b813d1f115b863b1991b6271e763/bunujiz.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/60245567699.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/82665580589.pdfIn PDF document text
    • http://bushurov.ru/images/files/94344333051.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/73368428717.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/71972971065.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/81636844523.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/5039949542.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/rovewenasikopugo.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/wekutenal.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/vetafesori.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/15760046404.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/22824607387.pdfIn PDF document text
    • https://ms01bet.com/contents/files/kivuveraxupex.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/wigekizaxavok.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4580b2d7678b9a213dd2f72903b633c9/jifura.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/gakamapamofajaxojujo.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210913_F5614ED052EE33A8.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/napajinuwo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613eef56dbab0---bupuveg.pdfIn PDF document text
    • http://quranday.org/userfiles/file/jupevuta.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/dejatokikoxowenalano.pdfIn PDF document text
    • http://status.cz/UserFiles/File/taxemanesokatazit.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e491dc93c4b04eed785e6434ece0ec79/735409997.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_off000109b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 18556 bytes
SHA-256: 341a59e691347768e29751dc17165553d1792d397926b9a49fca5eae2dcad1f5
font_01_sfnt_off00013a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15283 11056 bytes
SHA-256: 786dfc6e3fa2e1d6c1ef0a572d65d4f8b917048cfceed23cd3f06be77afa6915

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