Malicious PDF — malware analysis report

Static analysis result for SHA-256 acccc3d8b48fdae7…

MALICIOUS

PDF

70.3 KB Created: 2021-09-21 12:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5212f952dad565153bc1862679410ba5 SHA-1: 73ebd89f2436b1d02719cc85cd543682961dfcfb SHA-256: acccc3d8b48fdae70e8e965967492fa39133fb31f11cdc5cd5d2b6b98e9a47ee
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier flagging strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5837

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=calculus+early+transcendentals+8th+solution+pdf
    • http://wccflooring.com/userfiles/files/mamokufapufevulufomed.pdf
    • https://santehsevast.ru/userfiles/files/badisodufo.pdf
    • http://hvpeds.com/upload/contents/file/zivurafufaxosomapofa.pdf
    • http://yevres.fr/ckfinder/userfiles/files/topamirizujutopewelanis.pdf
    • http://monticellotownship.org/userfiles/file/rejadakusenepe.pdf
    • http://nickels.design/ckfinder/userfiles/files/77227557207.pdf
    • https://fnb-concepts.com/images/uploads/files/xiwapasutoxa.pdf
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/95836098910.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/56662729535.pdf
    • https://kvizek.excore.hu/ckfinder/userfiles/files/82054861276.pdf
    • http://temple.mo/userfiles/file/jesetujosanuvududa.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/wisakisemuniwiwerozukesox.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137783043ec1---befajavutenalavejune.pdf
    • http://veoguidecostarica.com/ci/userfiles/files/vomisorul.pdf
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/45648226840.pdf
    • http://lammensfilip.be/uploads/files/werebukoxufozawurejeri.pdf
    • http://analogsys.com/uploaded/file/121802732613fae2fbbff2.pdf
    • http://debschoen.com/userfiles/file/670748740.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf263d3fb6---pefexebutajoxuzejik.pdf
    • http://faradbox.pl/files/file/69712999280.pdf
    • http://chuabenhxuongkhop24h.com/images/files/nifowigonijabudebuwisero.pdf
    • https://groupekheidri.com/ckfinder/userfiles/files/tajabugaxunowinojedegedup.pdf
    • http://steelfurniturecn.com/d/files/83819547327.pdf
    • http://nexxosrealty.com/userfiles/files/pefanewefobuwelile.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c0f905f5c---84946417933.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_off0000bc29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC29 16792 bytes
font_01_sfnt_off0000d440.bin
200160e03815603c7e29ba05e3e676bbcc3569a0431044b82863606ad87d8b5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD440 11172 bytes
font_02_sfnt_off0000ee5c.bin
7e69d3120031cce18b735fea72841915377ffd5dd744c53221fc6885306a0b33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 19580 bytes

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