Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfcda4cc38d7895…

MALICIOUS

PDF

91.9 KB Created: 2021-09-18 16:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b522665df8d963990f498fe111b4ccc0 SHA-1: f02047ec2526c21de00b039a84abb4c773a263e6 SHA-256: adfcda4cc38d7895efa1af6fe83af00a2f2d7ea5563f5a39e2b90326588a6608
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown domains, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a pattern of using disposable hosting for such links. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it is used to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://studiozammuner.eu/userfiles/files/sulogusowaginep.pdf In PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/47055843125.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/boxugi.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210904_E76DD1DA5CB3A3CE.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/girilirirupeni.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/wuvobelirokitigut.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/60269008254.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090219235873499.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/5971491699.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1631461127.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/safajonefuf.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/mimefizudeta.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b87baa659---33764249346.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/nuxavabelunozefudi.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/dejatulojaxoxo.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/14020213790.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/33820845778.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/45861830197.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/kunereluterel.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/fomurimowa.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/19639268210.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/98085992157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=qualitative+analysis+themesPDF 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_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 10492 bytes
SHA-256: 108a268d261dbb4ed8ef7b82d54afdce08bbcb7ef3a237569ff7e4dba1075056
font_01_sfnt_off000119e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FB 18856 bytes
SHA-256: 2e2378493ff4032b968d99bc9c86487a6a15ec0cccd9620108f18082c230d49b