Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c5706d15c6216c…

MALICIOUS

PDF

80.9 KB Created: 2021-08-18 10:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4956e2606320d9398cdf0a57054f7b6c SHA-1: 855dd0d258e4786ed0f2fc3f10262261dc4e25ee SHA-256: 15c5706d15c6216c15fc6f2467cb3aefcc23842c8b0c076f366c8ba7daa50171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and link farm heuristics suggest the primary purpose is to redirect users to malicious websites, potentially for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=how+to+rotate+a+triangle+90+degrees+counterclockwise+about+the+origin PDF link annotation
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becc26ddbba---rufal.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/wogomonafutu.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/90446119752.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/28220433786.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/nujoteroxo.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/298ae23cc82bc5de234747a6e0226976/pegowaputuxuzugok.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e0003caa6ac22f07b327d77e660536a6/kejibetuna.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/mogaf.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/vukirovapuvetobike.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e292876aad8aa9efe9088d09006ae998/84824324616.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/zelozobenowuxarep.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b109857c48e---nazopomepifonenekur.pdfIn PDF document text
    • https://chptravel.ir/data/file/47024345972.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1226766f86---wotetusitogavajegaweti.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160764430076da---burumapapekusuribudodel.pdfIn PDF document text
    • https://duel.pl/userfiles/file/puzezolulodesasikegubiwir.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/degapfg3c6idaje7e1h8bguet8/levujakalikijam.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4c4255ca5c0de1394db8267759acb0cb/tejowejijuxepifefozokatim.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/21488295976.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/23824391054.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3505dc22e379482cadac03c5725d1be5/wilujutubuligazo.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/99817bfbf48203395771223a104c3e2e/50337378432.pdfIn PDF document text
    • https://melz-feu.ru/upload/forajujig.pdfIn PDF document text
    • 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_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 16660 bytes
SHA-256: d822ac794b001ab91c088780a745af9361ef330f0273c2470e67acec70c7fa12
font_01_sfnt_off000102ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B06 11348 bytes
SHA-256: 971880417c8728c871925dab21bfad292452bd851b0fbb7c88bdde3149686513

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