Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0dc00c8921e68f…

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 06:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 147d73df1497a5815f2d9da57835d28b SHA-1: 1db85cc6e278a0bb25b30d80188db9f7280421f9 SHA-256: 3f0dc00c8921e68f116f7aefbfdee4bf776119861d1c90ce907cb5863dbb0026
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the nature of the links and the overall detection suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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://laborke.ru/uplcv?utm_term=c+sharp+pdf+generator PDF link annotation
    • http://petra-koparki.pl/Upload/file/18479256708.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///remele.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/27101388954.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/92648146742.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/faxinazeze.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/beromu.pdfIn PDF document text
    • http://tiquital.com/documentos/file/68460451757.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210908014830.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/25205333849.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/lobepe.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/sumosuxor.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/85263750783.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/76465532564.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/simaxa.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a93e7c89f---60140753181.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360479160d1---35958739636.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109102252428746.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c8cddab6---kenejewabovutadik.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/vitadazodiv.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/lepewunixolekixigosixenak.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/97746687203.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/4420117009.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/womefudukukuxu.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_off0000e34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34E 19384 bytes
SHA-256: db78c53d3b764dd85dfa71ec8b216afbd7161f5af32e660de9995a86e674f5a4
font_01_sfnt_off00011693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAA 10668 bytes
SHA-256: 8dc2e0b073a6baa05d02f49b1140d0bf1dd8b44eef8df182dc88237da8688f14