Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0daf0d243c2410e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 06:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86d2f5db6c7dea2121a7aa9a6191537c SHA-1: 2c9a7bbfff559bafe5a5a3a89971626111cc833d SHA-256: b0daf0d243c2410e121f6368a0bd07df7dd95b368cfdffd329a1a4d7d0dbc9bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting domains. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into visiting malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=what+are+the+android+operating+systems+in+order PDF link annotation
    • http://lube-stc.com/ckfinder/userfiles/files/85909795364.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/77605901658.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16147eb2b4dd5c---29980576217.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161421c3a203d4---66623242261.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/jujulomebawenulu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/846505659ac806230453073b44d18312/22444205871.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613062871c3c1---mariruwuleperefisinike.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/1029353531.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/23588035442.pdfIn PDF document text
    • http://spbi.cz/res/file/42499151007.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/kelafad.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/gewajoz.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/60862336565.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c07049cac70d1526f07487c584f02d4b/ditifitaxoduxitit.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c5f7fafbd1f7bb6bbd997c272e2e68f0/94207414633.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/61345943379.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/zifufudunele.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/74073075452.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/judirobafabakezawojiwa.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/vujipitidokumabamome.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/malafimuduzidaw.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e4f3aa636c9e193c898458f7e2da14c0/debitexemide.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210908124726.pdfIn PDF document text
    • http://vln.nl/files/file/fetexemagefitojadinigelem.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_off0000ddc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC9 10900 bytes
SHA-256: 9a4880b7f83a5baed873284c277a4c534e69929b81286653c287c5224e90afe3
font_01_sfnt_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB7 17340 bytes
SHA-256: 3e995c7f41b800006e555bf8c28c4f9836330dbc29c21fee967792571b59e758

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