Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b738e64772214e…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 03:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6c468dbcba0aaf3bb2f663cfcfbe7052 SHA-1: e906ff7639f6e43b2e0a80833de086b0df42efc4 SHA-256: a1b738e64772214e59014c1f6c8421b7d1520b807b2b8d2809035574a7592368
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8680

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://coretry.ru/uplcv?utm_term=avengers+brawl+stars+apk PDF link annotation
    • http://radtel-sport.pl/userfiles/file/namadopigulorefiwodi.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/kubixevogifidipa.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/38405838701.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/67476696568.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/25852837225.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/40617648382.pdfIn PDF document text
    • https://fishboat.hr/files/rezikotepoxepesafuripuj.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/29099589727.pdfIn PDF document text
    • http://zamgph.com/uploads/file/112151551264.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/15lki5os4ue7a34cji1cvpjuh2/povuzuxoguzibilir.pdfIn PDF document text
    • http://df-2.de/images/daten/file/wazojapewasawut.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1867303819.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/sefigemizovo.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/63890887084.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/ketanefobova.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/96933369418.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ltpc9jl12b50hotm8k9ps37d0g/13771508193.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5b764b56---webudejuvog.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/71572842183.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/lojujaduvaxef.pdfIn PDF document text
    • http://benrassam.com/uploads/files/zalizaxolagenawejiji.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a6e1a4b86---25855573040.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/poruteruso.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/sujim.pdfIn PDF document text
    • 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_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 10580 bytes
SHA-256: 4c095ff31d1b681f756b0ac6043b1a171d4cb4aaeeece6384ee1d457b84ebac1
font_01_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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