Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb16f8f996443b5f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 22:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df62fd0d2dec91a4bd2b6b58077d2527 SHA-1: 7f44897c4fb0c6ec7e8a0a69553653e511cb89fa SHA-256: bb16f8f996443b5fdd7a95cb5f1a513f35ac3ba4524f3315ed72f5f7caadfde9
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or are structured as link farms on disposable hosting. The primary function appears to be redirecting users to potentially malicious or phishing websites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=genshin+impact+codes+new PDF link annotation
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136cd29dd492---muzonisemakalawi.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109012008587048.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/26165452224.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/28806518528.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/22385299265.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/92929982128.pdfIn PDF document text
    • http://myphamasia.net/upload/files/madubuvokiwatanimasij.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e0d26ee7---sikuboluropa.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/jasarudasifekatejowo.pdfIn PDF document text
    • https://grandegroup.net/files/sewedu.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/13211445763.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/pexumuwuwojujot.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/76783662353.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/63482432341.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/55137272581.pdfIn PDF document text
    • https://inks.bg/userfiles/file/metaseja.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/95bdf039cc39bd72e958f652195a3857/78265313946.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/20926302438.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/zutaserosox.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/10464448763.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/27854092715.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/gokimuwuxedilema.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1eb5d8c50---75599794633.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/57400166709.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/nekajujowibiwum.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_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 18144 bytes
SHA-256: 142edb2818c11533723f570c5bcdc32d89685d235cabd853e19bb269ff3ebb17
font_02_sfnt_off0001249e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249E 10760 bytes
SHA-256: 1a6f84edb8aaa63476f90764cfa40ebcc31da197472bc5dedb9dc8dccb127629

Open this report in the interactive analyzer, or submit your own file for analysis.