Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3a918dd028c059…

MALICIOUS

PDF

86.1 KB Created: 2021-07-05 18:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da85544157e3e529fb4422caab598faa SHA-1: 909d208b76e200c0f2b4ae82e8ade3cf42b6e00f SHA-256: 0d3a918dd028c059005b7eba287fd315f5c909fc0ae7f1a508fb5b878e622734
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains, suggesting a phishing or SEO manipulation scheme. The embedded URLs are designed to redirect users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/19025100329.pdf
    • http://hzdsbg.com/uploadfile/1625206615.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074755dad5e6---papavorewi.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a69da8c9bf---zavepenesumigadojin.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/bf0fb4d20e81291e05132c11b84494e6/89009561389.pdf
    • http://lapenya.cat/imgjovesnaves/file/muminufonovifojoz.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/tqt2l0p7mg1j01kk11q4sqqugj/55860894399.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/kridh8d5m0vach021i1vm6pekb/46046284721.pdf
    • http://kozszemle.hu/uploads/files/46422424463.pdf
    • http://www.aadhar-interior.com/userfiles/file/duwovoxikivivawirezus.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ad2b368d662bb4001471f16c27fbc32c/nemiwevujafusojufijozam.pdf
    • http://bakoca.hu/files/file/vepixe.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607675d9c1405---gofik.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079fc6171f0e---vubelununa.pdf
    • https://uclerbaklava.com/resources/file/23815006310.pdf
    • https://invest.pl/userfiles/file/kunajufeneduk.pdf
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/86123235636.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/ef067c828447ed3175d365dadaf6cb42/96633243419.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16075771c20418---zunenotubiputudisabowa.pdf
    • http://petrduchek.com/files/26496528164.pdf
    • http://4bx.pl/public/file/83805239683.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a650d5bf108---34353747453.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9d0d4849---xefanepexikifip.pdf
    • https://baxsporthorses.com/userfiles/file/27419606405.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=butter+cookie+cutouts
    • 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_off0000ef5b.bin
f530a55892dd8d653ece52fb035928ad93c20654e7fc9ebc78c567ed68e289cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 10156 bytes
font_01_sfnt_off0001064a.bin
959d2af0dd6c364772b1e7baf60b7bfe6e2ced8f039df81433624d06804792c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 17128 bytes
font_02_sfnt_off00013305.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13305 16792 bytes