Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d598259451926d…

MALICIOUS

PDF

89.3 KB Created: 2021-09-03 08:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 038537f1b1ac4ff72b24800bddef0bcd SHA-1: b9feb574b25e316927c492795998d71de70eea11 SHA-256: f6d598259451926d6d864ff8cc062825a9202f7d49c224978e1c2fcdfc318ac1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing lures or directing users to malicious sites. No scripts were extracted, but the PDF structure itself is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fortworthdental.net/cmsCart/upload/file/bevimonetowuvije.pdf In PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/45238417257.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ceb8d658ffb4f8802495cbdc1212eb34/97341677051.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/mesilajukekukonexidewer.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/zigojonezobiji.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/sinefajepanagikekofap.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c010079560a---nopevuj.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210716_F0DEF192E6EDD82D.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/kijugikesejasofezob.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d8c2309afaf9a9b53c0f670d9ea8e641/97900967073.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fbee5d99e625adc9fd1e5706d75e51d4/67103417720.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/35267366712.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c4bbd21acfe48bae074418f30ffddf26/88582556809.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed02b01379---korores.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/44542469667.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/tojavomewidoxafoxaxobo.pdfIn PDF document text
    • http://kkitv.com/images/upload/File/mowuwurutedumuzifibedere.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/fovewebefomuj.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/dipemak.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160725cfeca26c---zilasuxitilagolo.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/6022438259.pdfIn PDF document text
    • http://dietmoitangoc68.com/upload/files/59170992529.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/fe366ad6b3c8974af6f9ad59ffc4bff0/gupuzetatetul.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/wereka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=el+magnetismo+del+dinero+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_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 10824 bytes
SHA-256: 86574434afe15ec0213fd3ff0d9dfaebba4852b9c44e28fe4ed2f2d81d6b05f3
font_02_sfnt_off0001234b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 20868 bytes
SHA-256: 84c70e0519eb6e001fa2f94423db4c94a38104f521fac53edc6af9a2734c6c83

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