Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64eb532dde1c896…

MALICIOUS

PDF

62.0 KB Created: 2021-10-03 02:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b5738dfce2a4d74957ae9787ca21d9a SHA-1: b0c80070aef6f6b2d49a0bb3b55949edea9782ae SHA-256: f64eb532dde1c8962eef74db572228b1a5110adf93ee699c01c8a7c109b5bf86
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier flagging strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7005

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://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3ef42897630f351cacc08a4547a48b73/sisexomimarometonixekim.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157581b6753a---tofazuxej.pdf
    • https://mimpishiosatu.com/contents/files/48214898224.pdf
    • http://fotocaroli.it/userfiles/files/selopupela.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/babujajutuvujal.pdf
    • https://fanaf.org/article_ressources/file/turabatabijizajutuwemixed.pdf
    • https://dobski.pl/userfiles/file/68113694104.pdf
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/wususuja.pdf
    • https://autotronics.vn/userfiles/file/85442002324.pdf
    • https://ehlibeytalimleri.com/resimler/files/5572675923.pdf
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/jumotikelufiz.pdf
    • https://uzunlarpeynir.com/dursun/upload/files/rofibewawama.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/16192595042.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16150d2be0cdd9---17445932064.pdf
    • http://booklandbooks.com/userfiles/file/xokonunufewadomifuvawov.pdf
    • https://urologasdainys.lt/userfiles/file/xigewop.pdf
    • http://bestofbeer.ru/ckfinder/userfiles/files/28473163828.pdf
    • https://e-fasteners.eu/media/file/39444115285.pdf
    • http://wittymall.com/multimedia/userfiles/file/6525898270.pdf
    • http://bora.su/ckfinder/userfiles/files/1836151057.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615590a6b6561---gededesalovezo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=giles+county+school+district
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af4d.bin
258f6c8f3961bad1b7dfc2dd8d4b2def67a1f98b9f52b3a38f81b73660d64004		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4D 10560 bytes
font_01_sfnt_off0000c757.bin
eb097941735ccc065914b0babaf1e6642417165c55cac931f4483f9fa2174533		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC757 15584 bytes

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