Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0409f80ccc4ef3…

MALICIOUS

PDF

71.7 KB Created: 2021-09-15 09:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c3dc0ecbf7608af0f886be83b8b9293 SHA-1: e212f4cb5cee19c51fed3525dd269347c91eb39b SHA-256: 5f0409f80ccc4ef34932a6572b9663316705a23f02a7def757ceb502de9743a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=doom+patrol+season+2+putlocker PDF link annotation
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327be5b5938---kofoferuzamodiburexesad.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/30270737062.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/gozazezubinoximufolo.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/movinimisiw.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/87845178825.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/duzuwuzepezek.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/98847608841.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/58879406812.pdfIn PDF document text
    • https://renault-service.com/userfiles/98830265329.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413f944385e---jepupakujisopimepi.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/14843971640.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/7089747509.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/89921722513.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/32028498038.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/55114577500.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/guretom.pdfIn PDF document text
    • https://kapefashion.com/files/files/85751213356.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/72029146736.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/277034086.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/9929543674.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/42082238715.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/74898091822.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_off0000b4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F3 17136 bytes
SHA-256: 47a51a9d085155271d42c1a7d3c75328e2796f499fab09058c108d17a75c5f33
font_01_sfnt_off0000e0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 10756 bytes
SHA-256: 08d40e67c2465838069e7f549bdc9284bf2bbb2e835f5c83eb6c4f4f73f75e74