Malicious PDF — malware analysis report

Static analysis result for SHA-256 863a59f82cfc1903…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 07:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 22afc682b98cb9a47713bbdaf844e06d SHA-1: a8efaa05e1ddeaf0079f0bea3d1b57b388a3db18 SHA-256: 863a59f82cfc19033b1d9e8fcef1fc5226c433a0ef0496610eba43e0037f0028
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external websites, including compromised CMS uploads. The ClamAV detection and ML classifier indicate malicious intent, likely to phish or redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7143

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 http://alphasigmaoverseas.com/userfiles/file/17810680823.pdf In PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/tuxarabusizow.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/85943689859.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/belivod.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/lozodimokutokugigisor.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/29367084056.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/berak.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/51027832077.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/tawuzuma.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/newipotefunapukinawex.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b537d80eee5---foremafaloxegatisope.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/tisadexide.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/41342798315.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/61221891120.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/walagojugijaradajopi.pdfIn PDF document text
    • http://planetamama.ru/files/file/sajisepajalexawo.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7ffd27bc6---99548557141.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cc506a237---batuximezidawojijinodik.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161183e2fa34b4---kavujisu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7d82ee5d---71608291933.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/pewizupabowepojulorone.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c114932c58a---82527664240.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/fimebafejigadujovonefow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=netbeans+java+gui+pdfPDF 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_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 10820 bytes
SHA-256: ff332ff264f6e19cbbcb02bec70ee16ff720a777dc0bd0824d6c10676acc1b3d
font_01_sfnt_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 17580 bytes
SHA-256: 75b7d75804603769d806f6a0c537c10005a609d2c17946cb9936db2dd8b0e82d

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