Malicious PDF — malware analysis report

Static analysis result for SHA-256 92564da94e5674e8…

MALICIOUS

PDF

88.5 KB Created: 2021-07-16 22:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 562e7523bd06c2c5e81dab51d466898a SHA-1: fd7d1748526d4f93bd746d98de2c5c14b7245315 SHA-256: 92564da94e5674e886556c2f38ebadc5eff95d14f49291bf85c5ed2de0e8a765
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://anmimar.com/royal/userfiles/file/bijofux.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/13877538443.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/medumivasagitomurabal.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-24/20210624221138589542.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/5527545330.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/c374f1b92fc9e0abb3f01347173f374b/fikuxenepapevevumeluw.pdfIn PDF document text
    • https://slide-bearing.com/d/files/zubifufipabedololen.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/latarozolotavozitu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/lunndab6b825lebvpdvbgvh4k5/19829646772.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/28178616605.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83dfe2e006---duwelexirogugefoxaz.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/blot1q2j7gp6ohor64eatlb384/mezigubiwekowatidajex.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/26217376388.pdfIn PDF document text
    • http://faulkfamilync.com/clients/c/cc/ccb94402b1eed20a0583117be0c0b506/File/lewubiledusipinitisa.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/roforofabu.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/48934405308.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/66efd300c81300697acf7f4cc85105e5/pedosuwi.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609382885d243---sifuw.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/pulesiren.pdfIn PDF document text
    • https://tangente-mag.com/img/file/33714045694.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/xarinewojazeketavepuxowep.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/98185387174.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/limanoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=well+deserved+meaningPDF 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_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 10432 bytes
SHA-256: fd51daaba51f4360e67fd0f8ae3c20135245142f68175662fba54191a609d5a1
font_01_sfnt_off00010f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6F 17412 bytes
SHA-256: 7412c2ac9dafff67d9db72994e530ebbea38e41be9776de8452eaa7b39ad04e0
font_02_sfnt_off00013cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1