Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eebf1ee1c62699b…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 03:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a834f60760fa03bca506a3c865828b95 SHA-1: 4e40d60fbfa780f1c2004453e8d54faaaa0448de SHA-256: 0eebf1ee1c62699b991228b7f7e80046d93a20041f6b2941e2a586eb93ee4816
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://soojuspilt.ee/files/file/13156412524.pdf
    • http://studiomanzella.com/userfiles/files/tavurep.pdf
    • http://seosanhrd.com/userfiles/file/zodufeme.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613461bf9c469---dirapus.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143847c278bd---86178242753.pdf
    • http://free-note.kr/files/fckeditor/file/18087778246136bbbadd157.pdf
    • https://sagarexpress.com/userfiles/file/5455793562.pdf
    • http://shuimotongyuan.com/userfiles/file/febowodoxazefi.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3c9fb6f3457237de02402b54a7ad4f45/44555558085.pdf
    • http://dautuck.com/uploads/userfiles/file/gavigoguxagumezen.pdf
    • http://bsp-oblspl.org/ckfinder/userfiles/files/xonapezuriwexowobufa.pdf
    • http://happinessgown.com/upload/users/files/48149442034.pdf
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/jenagomonivakedejizadidu.pdf
    • https://branpc.in/ckfinder/userfiles/files/kulufoxibobofabopovipuvof.pdf
    • https://wintechindia.in/ckfinder/userfiles/files/18903802259.pdf
    • http://cokhilegia.com/upload/files/29283238746.pdf
    • https://cplastik.net/data/cms/file/65931950434.pdf
    • https://at2-turbo-j3t.com/contents/files/redafiva.pdf
    • http://papaicountrylodge-longstay.com/user_img/files/wuvulabolixidimedel.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e93c636c9---47998199607.pdf
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/3257319298.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+dragon+ball+z
    • 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_off0000b2a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A2 16792 bytes
font_01_sfnt_off0000cab4.bin
3055663414d44bfe0ba4321a9b8857673176cda6785bf98e5a3788ddda013927
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 18192 bytes
font_02_sfnt_off0000f9bb.bin
84bcd2e902ab46343f13a4968c013a33579a7074e43e55e7c289d5f6330c0af9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 10204 bytes