Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c48884e9b6bc8c1…

MALICIOUS

PDF

69.3 KB Created: 2021-09-08 03:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9548032d47165d20dba567d62ff0bbc SHA-1: 86bcb2471a83e4c4bda5b2f85d34e80c6a269829 SHA-256: 5c48884e9b6bc8c11f982614fcff0b061c83953622ef2ff0a1105aeab3b77f21
124 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 disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely phishing or malware delivery through these links. The file's structure and heuristic firings align with techniques used to distribute malicious content via external links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4905

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=rampage+4+black+edition+manual
    • http://musthighschool.mn/ckfinder/userfiles/files/babofewofe.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bcb6095b6---jinejupejexetu.pdf
    • http://axiomestates.com/userfiles/file/64000819690.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ab929264a6dfe2832a83554e675fd0f5/vatalifujifomod.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa47c7e7d---xekik.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e04bad304fc---faturawonideriluxupuwen.pdf
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/69402123042.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba49e662422---97823980870.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/52720500622.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608740159da0e---befuluwejeribewa.pdf
    • http://accessprecision.com/userfiles/file/27371773124.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/dda7e0d3aa30fcbbd9b7e7c647472103/weloteraputosugozevep.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108108b12cc7---gukobafeveluxalogixi.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd9b24cc3---53168018071.pdf
    • http://flooroverstock.com/admin/userfiles/file/88771538312.pdf
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/63866906885.pdf
    • https://cicadit.ro/UserFiles/file/59796103989.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f01793a3031---ludopodekuvepuxedozefenit.pdf
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/gijek.pdf
    • http://rkmaster.ru/uploads/files/xesegemifikadetovanadu.pdf
    • http://rld-carbon.ru/file/fivugu.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baa71b8700---13806837870.pdf
    • http://newabel.com/ckfinder/userfiles/files/tutogadijizago.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/toriduxatedenosikipuji.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b848.bin
d0e25f7032ded6cdf569a77634db293c6fbdbe65431ed0e6677f5790d7d87921		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB848 11044 bytes
font_01_sfnt_off0000d197.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD197 16792 bytes
font_02_sfnt_off0000e9a9.bin
3b727641bcb8a08c2c7956b88f35bb039495e72525f365ead71be185a64f289c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 18020 bytes

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