Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c664667d62e84b…

MALICIOUS

PDF

64.0 KB Created: 2021-09-01 23:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ac3d85a393b7e3280893b433d10a2d68 SHA-1: 5e1e6cf46ef3883345c175f4a35cda15da600855 SHA-256: 63c664667d62e84b39e69072b3584e65c168e1a7abf7fb18c29796956526aa19
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ClamAV detection and ML classifier indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6812

Heuristics 5

  • 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
  • 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://didacostruzioni.it/userfiles/file/midujezoraxumotisujopem.pdf In PDF document text
    • http://homenet-spb.ru/userfiles/file/53144179602.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/bafebuzifurelatazonot.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/31200111266.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ce170c90c3f2c6345dc5be21a7c56c0a/jisitegifenowal.pdfIn PDF document text
    • https://businesslife.com/content/file/61004069788.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021080520500457.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/18252149010.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/fidigiw.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ff19fa52d4ebc4aa43f948f1db97dfb8/benowurozedujupiteridum.pdfIn PDF document text
    • http://altinay-law.com/images/file/sovodad.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f73bd61ba35dbf592b26aa2b33cb5937/44261922001.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/6c792b91916ede7df7bd2054df05dc58/93816609235.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/61835207324.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/gogezefeg.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b11a9eef430---5268094209.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c63df1d0b8f---woverifituxejedaj.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/dujenakoxi.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/lurajemonolise.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4048c8e4f---kufix.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/pisab.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d1a998956---74326989992.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210901070501.pdfIn PDF document text
    • http://www.bandungmesin.com/file/vidunawuwezuj.pdfIn PDF document text
    • http://maihome.hu/admin1/file/75733884207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=royalties+of+royalty%27sPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC023 10296 bytes
SHA-256: 825255233d82203cdacccab929bed482db15d4a1a8c842b1d5e4e65ccef17255
font_01_sfnt_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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