Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7119a9384f8f9f0…

MALICIOUS

PDF

83.8 KB Created: 2021-08-30 23:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 268789b7df38600f91649b12d599c75d SHA-1: d5ebfeabd398b1caf19783406d1aa74dc155aa43 SHA-256: b7119a9384f8f9f0667a0009abdb741cea2191d8a680d19ad9dd23d1b53af5f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and link farms indicates a likely intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33374ddba3---badafapezapukuxiwemegado.pdf In PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160714afdc198f---dibibotawa.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8b9520b4---zuketulo.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/xazokokelufeduzekup.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/fupexiraxajixares.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/20030525032.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/33522937004.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/89143651652.pdfIn PDF document text
    • http://alkanboya.com/files/file///sajaborarodowabap.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/wunavuz.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/tazetadonesaxiwekuvelaru.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/3b17d2bcdf30645de02f70f6ee7cc26d/jegalizutasilazuzov.pdfIn PDF document text
    • https://yodobashi-church.com/bepogubijixiki.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/m2gbp2p2qpt3gpnmeehi32t9o1/bexes.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608efe113918e---86865157907.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/61462794246.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/pulatituwemexefexeberefu.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ianf4lh57ac4l20ip6lckm4tt5/komazerorurelebekipoxexi.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/588f2b592482cd5bf389a7ea02dfe374/vupuzokoxurobawezit.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/d76ff503c94390b12a4be6632880bdf6/gepuvigosalawoj.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/55637142333.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/vosijobi.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/voxegikasekubatedomofi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc180b6323---metodajimirejulixejizovan.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/10841161361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lovefilm+picture+quiz+answersPDF 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_off0000cf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF16 24188 bytes
SHA-256: 9126ac8fdeaa81421a6f893c508fb028519e1745022fc7f574fccd026cdcd5d1
font_01_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 11056 bytes
SHA-256: fa095cacf1ca92ad78462464c08259155a2188c10d70ed23e0ffed56b020b31b
font_02_sfnt_off00012660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1