Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d3362b99b2a758…

MALICIOUS

PDF

80.0 KB Created: 2021-07-23 16:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77ec167080ba4b417d1cb372ea958682 SHA-1: ef2a5b8a3c2e26f18ab74872606513a0890fdd1b SHA-256: 83d3362b99b2a758d85dce8d1370bf09a76b17231a4a724debd208683349cffb
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links to potentially compromised upload directories suggests an attempt to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5648

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://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41ee3aec6---bafopenisopamarogejawose.pdf
    • http://dynamic1984.com/user_file/file/saxazogakoparejuvakifidep.pdf
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/0t44kvvrbsoihiqrk3a6r6pd9g/34291839743.pdf
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/zavosejukopevibiron.pdf
    • http://yuha.be/_files/file/22662909817.pdf
    • http://fixafilm.se/userfiles/file/mawadopuwa.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3c57fa23ffd6d98edb651f7dd1c699a0/85275349218.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5533ce9c6---49323458973.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/dg3cbkcc6kd8o45ci257t696d3/bewanesowi.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/80532940751.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/37d389993fb95e9aabe8da49ac9f55fd/13277405065.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/19615444106.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ac2b59643---71056171584.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/wepesofuvowotivaluwavus.pdf
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/3105920863.pdf
    • http://www.urbanwaterways.info/files/7778372470.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e8bbce6a---zasubig.pdf
    • http://cisseo.net/userfiles/files/57105344458.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef0286b3be---wovipibareb.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c7de4413e---punuxadax.pdf
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32810946149.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66797dbf94---11210421908.pdf
    • http://hophungvietnam.com/app/webroot/uploads/files/95051001001.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+uninstall+driver+booster
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010408.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 16792 bytes

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