Malicious PDF — malware analysis report

Static analysis result for SHA-256 96428166177f6212…

MALICIOUS

PDF

84.7 KB Created: 2021-06-30 23:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 962510598b734b26bcff1c2c173fb7f6 SHA-1: bb0bba91447dbcd04e67bd32b7457e13f092dab4 SHA-256: 96428166177f6212fb40e596c0f5b6356fbcb2f875dedd9355ad5683a7430b45
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malware. The file's structure as a link farm suggests an attempt to obscure the ultimate destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c220e20cd438082a9d953d1f6def9f18/22375158741.pdf
    • http://laros.cz/UserFiles/file/19547181900.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0529/6ebae968e5e34c66aed62155b3ad5f5f.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070e04ceffa4---zidir.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/23fbf62e41db88b29d176ca4ca3f4d3d/87313487986.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5508012f43a3ee6ddf7f73a765f86b2e/16645457291.pdf
    • http://p-itos.net/admin/userfile/image/file/solidet.pdf
    • http://freetourscadiz.com//ckfinder/userfiles/files/82424113730.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/feda725cf32683a0866d4c4deb4535a8/71055554012.pdf
    • http://botosani.ro/img/uploads/file/78472046487.pdf
    • http://www.anjhimayath.com/upload/file/lakaredoworobowez.pdf
    • https://koratspring.com/upload/file/josus.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c53b977aaa---sixefafutemi.pdf
    • http://willbramephotography.com/7318034835.pdf
    • http://knuhpharm.kr/userfiles/file/20210616141248.pdf
    • https://emilline.dk/ckfinder/userfiles/files/gitokufunolasotekomax.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6e89493c9---75638992556.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/95748cc818d2c1f0bd83a17438051617/65227755233.pdf
    • http://eltonltd.ru/sites/default/files/uploads/zibep.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/2iu29k40nhv770vtindg7qu5f9/sifipikedasilo.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/31418063616.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/9hl9qs5e9ql8p7v4486f8jbj60/wapuwekase.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+voyage+out+woolf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000e811.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 16792 bytes
font_01_sfnt_off00010023.bin
4a38b4588e7b6890a1c1a3036641cb033d51cfa4fa814cfdae88cae7b41ca1a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 17564 bytes
font_02_sfnt_off00012e2f.bin
1e57e2d189a76fffee5d5f9a528e3cc11a9b0715232d2721244461f0b9904a14
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2F 10356 bytes