Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbce9c09d4e7bf7…

MALICIOUS

PDF

68.1 KB Created: 2021-08-20 10:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8d75be3a522d8c96f89f4c98d480ff83 SHA-1: 5aa806364dc53d0f8d1209a8629cd37b3d2d8c77 SHA-256: ddbce9c09d4e7bf77e446fa381d299eded65a194add11ba08dff21041a2bf23b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to sites that host further malicious content or exploit kits. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9664

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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=capitulos+completos+de+fisica+o+quimica+1+temporada PDF link annotation
    • http://lovelyspa.net/ckfinder/userfiles/files/nojafepu.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/e93kiphk6eoo284e9t3tk8j6l9/98489115477.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac33665bc78---69897440473.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/6632d219e164f244dae46acdb90a5673/rabofox.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/motipogetitagipugop.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9012e489---ketidi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608236dab381a---85003226018.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/90088359742.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/56094288069.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/81106660320.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/gosexo.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/72981019001.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084875ea05ae---jebifewoti.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/66718021782.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9affc4f798---tifowimukis.pdfIn PDF document text
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/kisumuxalukufisezuteris.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/salimeduwovida.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/76335666042.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/77112756546.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d69ad42afbd---22877914643.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161075bb94d1e5---93963918485.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a29766c45c74cf51fc7fcecf065b22bf/xamoresowebedipipiritu.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d51e5d0c7---divimetomulikomusuwibeva.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acf64cdb6e8---84582280079.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 11004 bytes
SHA-256: bc17cd1931b936e555f48b1941dcf793302427c4fc4535bf4673e2c6d75be636