Malicious PDF — malware analysis report

Static analysis result for SHA-256 0025887d4b9a0c5b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 10:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87c2ec22808d8be18614e2f8f335867b SHA-1: f61df364029ad6bbac53b6d51f18f0c83840863a SHA-256: 0025887d4b9a0c5beca0ca36981a79dc441ab22f503cfda0d5d5bd9e228869d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate malicious intent, specifically flagging it as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest the document is intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ab23f48bb93825bf60e02f6fe99edb07/tirab.pdf
    • http://jamalcar.com/userfiles/file/64363606013.pdf
    • http://worldcar.jp/userfiles/files/jimifinadobulusebuduwupax.pdf
    • http://xn--80aesyq.xn--p1acf/files/file/83573563546.pdf
    • http://tnmetalworks.com/images/files/romizefoz.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/208d1645682a8e9311d2e86fe9dc15db/tajemugoxiped.pdf
    • https://medosojewellery.com/userfiles/files/miwezigolopoxulosi.pdf
    • http://wefocusdesign.com/upload/files/matofoxegirifotu.pdf
    • http://estatepie.com/files/userfiles/file/falujinopipomid.pdf
    • http://iproperty.ae/userfiles/file/38886584178.pdf
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/13393161293.pdf
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/xiwexagufilebevago.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/54274443344.pdf
    • https://xlspandoek.nl/userfiles/file/wutujalegivuxisuzonodaxid.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/41a3bba0ae722d1c1c72d32011d47017/bewugovutotigefudez.pdf
    • http://centralcogtc.com/uploads/file/89541241944.pdf
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/31614003364.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/611ea4fe7e8bd20fcd606444debc8a5b/gelulexive.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/64180389583.pdf
    • http://patrick-vallot.com/upload/files/53889395976.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5a3865771a86952b40772d2e74d1dacb/fukidotum.pdf
    • http://rungruangsteel.com/public/upload/userfiles/files/68687929262.pdf
    • http://captainkillmite.com/uploads/files/202109140823554847.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=marvel+avengers+initiative+android+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9e.bin
498c6f5f14eee119a0b13b4b51469c3b5551f3e484b602f58e37210156da3601
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9E 10568 bytes
font_01_sfnt_off0000f5b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 16792 bytes
font_02_sfnt_off00010dc8.bin
f466fcbedb48c4f1f2c6ec45aed0e3c3069465b7bb82ab0f90a2b171a9656cfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 21636 bytes