Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53e0cd40b640522…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 04:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 396e28321cf597f61be0803b41688ae7 SHA-1: 573cda18ed6f6c84ecb46ad8ecd9041e0a400e8f SHA-256: b53e0cd40b6405227d2c6450cee241af23d4404e0895760bc8179f0bd1995bcb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://oniceh.ru/uplcv?utm_term=last+day+on+earth+hacked+version PDF link annotation
    • http://dom-2000.ru/ckfinder/userfiles/files/21275702200.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141bd27913db---jinagewadigazunawu.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/35382348061.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/selonu.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/85070951021.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10af2c507---70816228285.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/zepotajimaguliwe.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/kuvokawexiv.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131782c74be5---92867975038.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/16189516191.pdfIn PDF document text
    • http://abwessex.com/uploads/files/79999010201.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/tenerirudekikabam.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-02-01-17-32-62.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/31544625248.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210918_A33CD61EA2FDEA2A.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/sigegomonoxodonaxukazaba.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/talotidakijovitop.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/90096260138.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/zusaxolomibano.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/napusesilalapewaradokop.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/55372363585.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///81193159469.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/39842908008.pdfIn PDF document text
    • 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_off0000d059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 17220 bytes
SHA-256: f01abe7b8bae8e428516983da5441be2d77db73587940c3e701e96205b9f3b39
font_02_sfnt_off00011522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11522 10648 bytes
SHA-256: 3e4ba7ac7b7d17175ac3e0859b0fe858568d229ce6f41b02aafa0d8dbaad61fd