Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b75b40fd2b9573…

MALICIOUS

PDF

72.2 KB Created: 2021-09-07 09:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d976ddd68619d6dbbf59d12cdcffae3 SHA-1: 7ba01fbd80aaf74b013e10cdb1142363f8234e14 SHA-256: 03b75b40fd2b9573895abf1664be9dc9d63463aa4bdd32920f00859d7228aa4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610990567fd53---35753001927.pdf In PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/8tlrp6j0b4tnn1tvldbjinalt1/winorigosapibilawesu.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea09f1c47c---lefamujigarate.pdfIn PDF document text
    • http://tyextractor.com/d/files/jozalelivoladat.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/62507578131.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f717e253e---rorukimenetoninigiresiki.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/ligawudomivenu.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/id1doen48cvs8eu7qs2rhrrvq5/fabukibofebu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/mazawufo.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/c6v1tq00vnlon5tmd12235o31s/34792579009.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a956645551f---59491396483.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/25456458007.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/74046097120.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa50887cd7---nakigekenabaregu.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/femapula.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/84650551677.pdfIn PDF document text
    • http://i-physiology.ru/upload/gizaga.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/21650692789.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/12562219917.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4c142c71ade401129b72f9ec2c9b0533/5237284315.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/zejimalafadowatarekakiji.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8f88f235d---17605459791.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ro7q28q10pjp78nmb1f1hc30g7/nomepogaduvoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sloane+crosley+essays+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_off0000bb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5C 10612 bytes
SHA-256: 8eecc261dbf9a4eebc2ec75be67ea826befb7126a90850e3297df0b610826649
font_01_sfnt_off0000d3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 15748 bytes
SHA-256: 84f8e8d55c930610db68f1af7483f8dbca8ed9fd457e111d66f1525bcc191a2b
font_02_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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