Malicious PDF — malware analysis report

Static analysis result for SHA-256 9253ef051a9b02d0…

MALICIOUS

PDF

69.3 KB Created: 2021-06-05 02:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cc038bc9294b80e52515685e572c705c SHA-1: 5de44cd8bfdc469a97b7afdc65eae6ece1b00787 SHA-256: 9253ef051a9b02d04f0df49347ddbc3d082f99c70a49c20bd80ef88e82553648
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting and a UTM term redirector further supports a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8846

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://pistant.ru/uplcv?utm_term=monster+warlord+hack+mod+apk PDF link annotation
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160809c2fa7b29---dutudixepaxes.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4vog7d0uh9gvamftin6ghe9o5n/bewowakudavovejejow.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b03b89abaa8---5237804634.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c085c063462b6c8368dc27e546f32078/23906121026.pdfIn PDF document text
    • https://norservis.com/files/files/resepom.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d0a97f0f5---17460510154.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3257de47---39655578638.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6ffe3d0ec---nogojemuvotulogejenaloxu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-22/20210522164400761564.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/69fadd94d9ca4ca96990b0ca34a7b228/31084144996.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609abd99eb5e4---4602164223.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256b1e2f83---nowokovodadezovujixejovob.pdfIn PDF document text
    • https://aashianarealty.com/file/bapiluxotizipujufovuwukan.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/35709817653.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/5922544372.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 5472 bytes
SHA-256: aa19ef40878bd40f9615accb99aeb91db4db6f54abeb4aab5180f7d9569e9ea6
font_01_sfnt_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 18456 bytes
SHA-256: 27712cca6a32ef574c3a2efbe9885103f53dcc1a09f07ddc6e3446d525da36e1

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