Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59444b65e041846…

MALICIOUS

PDF

81.3 KB Created: 2021-07-23 01:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4d9f2c78dcc1392044b4b03ca38c288 SHA-1: cd9ede90d3956d03b987cf90936c7d794ac00c18 SHA-256: f59444b65e0418465d102d073ee902cfcaf09002f162359b99e488fa7429592f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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
  • 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://bisnismedsos.com/userfiles/file/77822185053.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a36d537a4.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/c58tmvkdgc2nrhjl9vqf1imvem/11596788563.pdf
    • http://www.deep2001.com/images/library/File/39046248451.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/47b17a500af7300a541de19b7264f5df/72265965370.pdf
    • https://clearpatth.com/userfiles/file/kovanogifulisaz.pdf
    • https://frpeteradeyemi.com/userfiles/files/93055093726.pdf
    • https://umartravel.com/files/98591810434.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/45309128396.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9f7d0cd1f---42555582161.pdf
    • http://etoprosto.ru/ckfinder/userfiles/files/tuvogoxaritevigujugofava.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f781d137---gujefikerifonezun.pdf
    • https://aucordechasse.fr/vosImages/67127062519.pdf
    • http://weifong.tw/fckimages/file/99205662911.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/1f1b6198bc6d7390123769ac14f66b84/tavivebuxadoxukanajiles.pdf
    • http://nepodoshlo.kz/ckfinder/userfiles/files/31712588015.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c383c5ad---25588924351.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/469c921c86e5379a082318edabc56894/79537020872.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/cc2710597af8747eaff5ea0df75e0930/2867988230.pdf
    • http://texmet.pl/userimages/file/5911855933.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/61377609620.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9575b26aa0ee5c994fdc16f5dc730176/42173648633.pdf
    • http://easternsheep.by/app/upload/file/levetixo.pdf
    • http://praconsulgroup.ru/pict/file/padupaxibexemisoxawul.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3cb9395ad0a344576dd8b732546db3a2/58780857632.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=manual+for+r
    • 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_off0000ddcb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 16792 bytes
font_01_sfnt_off0000f5dd.bin
697f35bdbe9403d24ebe982509f3e0bb9f803c27cf783e2eccb3cb6119d8dca6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 16972 bytes
font_02_sfnt_off000121be.bin
19bedc3db806e7eb94cf870adedf3229b5dc32ccd081e88853077c3e10662fd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x121BE 9812 bytes