Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb50ab6147b7de28…

MALICIOUS

PDF

72.8 KB Created: 2021-09-14 15:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bdebf4452d5baeb9fa07df1026558fd SHA-1: 7fe416f87253ccda2d294620aebedf38fbb751ad SHA-256: cb50ab6147b7de2887e58d6e265ac7a3c14bb6f9d2970de914cf33f4f1fe9c2e
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of multiple PDF link farm heuristics further supports this. No scripts were extracted, but the overall structure and URL targets indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=the+owl+house+123movies PDF link annotation
    • http://kientrucnhacuagio.com/upload/files/75280399059.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/0a585d0ad00fa98c2df486c0ab005fcd/21473958271.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/42304894028.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613a77f736390---97595877695.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/madenele.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/14614168634.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/53161464498.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/wewipibimi.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/fikavalaxixujono.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/75757271506.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4ea29361e66eddbddf04b6dde0b400e0/22163012308.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/fanokoselogun.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/pujorigevovireluzew.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/kikakexozet.pdfIn PDF document text
    • http://partnercable.com/files/sefuzidudonarakolugex.pdfIn PDF document text
    • http://sofar-france.com/userfiles/file/5579682632.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/73339486329.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/76258931542.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/60090441353.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/23859068466.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090510043073499.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf70a0318f---13949044614.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/diwusapupasul.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
    • https://indavideo.hu/video/the_wowl_house_1evaIn 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_off0000b708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB708 10468 bytes
SHA-256: b92167346f90caebf3324d44c7f90d1b32fa2efd670ff6d1b2cc6536616847dd
font_01_sfnt_off0000cefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFE 17260 bytes
SHA-256: 1ee3de9f2909196c8c6d4391c1cbd049ad62faabc0fb411d00e8e089f9ef3c0b
font_02_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1