Malicious PDF — malware analysis report

Static analysis result for SHA-256 213605eb7910041f…

MALICIOUS

PDF

83.4 KB Created: 2021-06-28 04:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5d0095146fb4e6919639dbdc31868d15 SHA-1: 7260288d723ffa9e8ee8192c8895360eaecd18e0 SHA-256: 213605eb7910041f9c677bbefe9356966877c94a034915ab8d061322a59cf83c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9813

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 https://veterinarycarefoundation.org/userfiles/file/87177611191.pdf In PDF document text
    • http://solamsys.com/userData/board/file/podavofoj.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/latejiwojisuwifobefumidu.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/11886392126.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/kexikixep.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/86bc9e1aa3157fa8e2ff338a740a8d2f/8886355568.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/goletew.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2faa87e26e---gidegigerilano.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f96ab7295771486096b8e75bed65d105/2515846719.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b411ce3db---24907969029.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/17397374958.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ac256024---80100075508.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16076833feaf87---muxogikuvumomuradijafa.pdfIn PDF document text
    • https://alutat.com/data/file/korijufobinuve.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/782c5933ff949f1a1f51bd6488b51c83/53926310.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8813d1e231f4d4713f277c9218806611/66539110507.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/8d5021db2a7f2603069430757c34b606/9123826741.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af6401b719b---7396043528.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3ddbcf98---51121022530.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021061701534913.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7fdd4c44a---bemolinetojozanewirusotox.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/30537254401.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9ff2e53a7924a584cdb615bde6e933be/vapoj.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076af5239aa5---56934957779.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a3f7a543---68154041722.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/tovakosivolizufarisavuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hs+code+for+tshirtsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 17556 bytes
SHA-256: 87647c580039a00f0217493c11ad56921a03803fe8a1c2f47c47715a23d261eb
font_01_sfnt_off00010fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BC 10252 bytes
SHA-256: 21a88e67576e65b378c94a96e30c00ad3191313baa01a3f783266e34280478c7