Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c4eccc10f08a23…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 21:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17ec212361f8beafebbfe4aee7835bce SHA-1: 3dedaa75e2dc5ddb625709df29d7ca61b24d7485 SHA-256: 93c4eccc10f08a23dd68f99820e175c67cfcbee4c86ce58161d4a374405c3e94
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The presence of multiple external URIs and link farm characteristics indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://valsadindustries.com/userfiles/file/kikagogupulelo.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/505e941b6f57e14db93c7fda7e0e1019/7274726531.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/fujoweromozatuvajapej.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/netamazudofigesuxoka.pdfIn PDF document text
    • http://iphysiology.ru/upload/kiliwogog.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/584cc60dc1c617600c8335f14c37835e/91608401955.pdfIn PDF document text
    • https://csn-alliance.com/data/files/57577345423.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/44107976946.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/58467792979.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/55696645947.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/78214221190.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/14348200903.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423f3e30b4e---20947336860.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/nusonevagakanozibi.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/venukaxipujulapinafov.pdfIn PDF document text
    • https://mahae.hu/files/files/kobilax.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202194147587907.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/090fcc2ed35f7e20f164076e1b04816e/83711435536.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/dokawodetudepe.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/3073150487.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/zibofilotiju.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/53624437342.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613397bab4b28---gejudebolananofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=spoof+sim+card+androidPDF 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_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 10580 bytes
SHA-256: cd7e7b5cba49bbd9b0231b3ab73f07163126d64145cc46c8d65c6af87e71005d
font_01_sfnt_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 17144 bytes
SHA-256: 502b3082c70f5ea1d9477a330cf1cad4e99b8c8714034e8cc191d9ab5a6419be
font_02_sfnt_off0001277f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1