Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab381ec0a3dbe546…

MALICIOUS

PDF

69.3 KB Created: 2021-09-06 08:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d1d5e884dcdbfbbcce7834391416453 SHA-1: f26db4c985094b2988ccfae6d12dec59317c42dc SHA-256: ab381ec0a3dbe54605774ae60f9a86d0df43c984614e4028db1ef38bda2f85f7
154 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. It contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting it is designed to redirect users to malicious content. The heuristic firings indicate it functions as a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6772

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
  • 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://synerhu.ru/uplcv?utm_term=proficiency+testbuilder+4th+edition+answers+pdf PDF link annotation
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/cb4273df6a020d5c44f65d1e84e23841/xebefotuwevowik.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c70a59cc049---xogaxawefew.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/dewasori.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/wiwitidogagazutapogobaxo.pdfIn PDF document text
    • http://charivne.info/images/file/xidofijekezuwazumoruxugak.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/kivimizakojejoru.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/subukosajidapufepeg.pdfIn PDF document text
    • https://actor-conseil.com/files/file/39679341044.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/85090509046.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983d97114a1---letubebe.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6b1ff5454a8312bf687cd0db54e6f1ec/82487369440.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a309e529b1f---30921166041.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/kukapuvunujinar.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/rosodoxuvemo.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/lasixonirasosu.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/54726535110.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/78985646702.pdfIn PDF document text
    • http://maksimetall.ru/files/lavizosiraborumikede.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe86cac444a---23291612301.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/12742007732.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/2543552401.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/824464053.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/38807719614.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_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 11236 bytes
SHA-256: 4c85195b8ef35e49a9e769dc37fc2a34af2f4b73f92c6dfb73c2e6ef9f67719d

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