Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a314067655ee28f…

MALICIOUS

PDF

92.5 KB Created: 2021-06-27 14:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9a740ee975a3f9f08b90d66e33200002 SHA-1: f07eef0f629472e7eb4d1ffbb90b8364a0c8b3b2 SHA-256: 0a314067655ee28f43675f173e57b53e0462e89f1344dca3ab2b0055690fb18c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host or redirect to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves luring users to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607814b3be124---madezolukowewafelusaj.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20cb3daf9---fipifofepabifoburuzu.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6d5ba153e---miritetewolafo.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/29769697491.pdfIn PDF document text
    • http://aps-mes.com/files/file/xevubipulubekuferup.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16078e34fe6e9f---lazuzezafoxerojetazavepem.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/liruma.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/71490170358.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/buhr9v518ubgbrhqe107aolpr2/jojudaratazoruf.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dd1319a5e---79526756092.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/69470139672.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/bhtqntjk3sfpca9nd8ufv0mh3j/sowatuganano.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075861ac4417---61279991284.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/88106506105.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210626_96FA66925A9413EC.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/vimevene.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/fea6127bb70aee1a35259f046a6f968e/vosagodasagutojaworufa.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/37d28a6a3cd3dd87def278fb8d79a9c8/jixinililotuvitekugawapi.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/nisibikuverurirowukevu.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/hj1ubtmn7psabicjgifelpvdlj/zevanofofafijubu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a4364d55a3d4f0a00d45f06a4f98e2df/suxanuzuwaxukegaxuwazude.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/jonulugavuso.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc1cbbbb5e---44791117653.pdfIn PDF document text
    • https://ocw.tw/uploads/files/demibuwusobudozofavomeked.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c4d285d4---rofarejidopori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=mini+1+helicopter+plans+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD283 10764 bytes
SHA-256: 6c7d2951692a13d7c4743933274963fd1ba2b75b139638dd49e347e76f645d8a
font_01_sfnt_off0000eb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 17632 bytes
SHA-256: 58e63e16aa91a920b97e98eae3e3eaf36ce6dc470d47dd1b2ef8bf4f3fcd48ec
font_02_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 25476 bytes
SHA-256: e38aecd2773d7cd9ac047f387decb48c1defbee0582d95634e067205fbe229f6
font_03_sfnt_off00014a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1