Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a72d24376270a6…

MALICIOUS

PDF

86.8 KB Created: 2021-08-11 10:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89c500c4d9943f257d6efd867d9c84e6 SHA-1: 9088ba04e8afaec779addf84d964846badc04d1b SHA-256: 50a72d24376270a63aca6a15a84b9a7378fe9f5a4f3e5faff74a048fd082ef6f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms on potentially compromised CMS uploads points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=where+can+i+play+coin+pusher+machines PDF link annotation
    • http://louisamerino.com/userfiles/file/zufarobewisawutob.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/33726904485.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/gotid.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/50986404519.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/zibewokepurofanewima.pdfIn PDF document text
    • https://grandegroup.net/files/vibazajunuke.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/49835022096.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a20b40a8985---93041072783.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/52497450366.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e465c852b---gaboterasonisimageneri.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/wivapege.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607554b759035---wetet.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/setiboxadopapugosorutoraz.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/8562177178.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/27288891822.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b6e11921423a435dd89c17be72733528/16864947473.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6245c974a0e643208aa0cffe829c43bf/10962891763.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/3004703672.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/404d2b0eac87c652c74def85e2c6de64/13046747852.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/nesarinugexo.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/8616272991.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_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 18180 bytes
SHA-256: 9e0c0d7a7b83fb725d64988030b6d6ce921f3a718b9870204abb542c5977d7dc
font_01_sfnt_off00011cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF9 10748 bytes
SHA-256: 32970d313ca77f75f40471476c35c59196750852bb3866f87b70923eb60b30ec
font_02_sfnt_off00013582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1