Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f3c286628a3302…

MALICIOUS

PDF

92.7 KB Created: 2021-07-13 06:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f69892bb7a94a35b81e396aebc883e6 SHA-1: b0fbd8c7b02dabb546328f99e050fd494025635c SHA-256: 69f3c286628a33021d87b6fbc80c66bf6e251b701cc738301e2bd121921b6941
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/5b9f1a5bf5b9017baf0bac6d7eb94a94/25441986020.pdf In PDF document text
    • https://hse.tw/upload/file/fejevizumalegekog.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gu0ug47s3531td4v34ispkinp6/wumuxabumalulumem.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ivq97c3vio1ekn58bsledi7ktd/93675403652.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/jigonulewulujibudadepako.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21b46ec11---fadutumitom.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/tugokasesoxiwun.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b4401edc6b01b6a88ce62c71448b964/37513102266.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/buzeginapejunefuz.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210524174252.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/92897230851.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/j3mb86gb2u34js9ooij5pbnn5k/nowagere.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/12623597662.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/38276888873.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ab4366d0---labevifefefapexafudidufiw.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/94710720086.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7e3c4b6d11fe7b9286c96ef551495c6d/zedozon.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/pabalonemimura.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/11514891661.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607822997869f---5360668283.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/290c6b13a7fbc00d97e87646547bf652/36824950959.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ddbbadfa1d7c570114dc3fe137745033/vexomagus.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28f0c49c18---monuzonafadoxidilujolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=craftsman+router+manualPDF link annotation
    • 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_off00010b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12323 10416 bytes
SHA-256: f3eb9f4c8cb8589304512bf8dc6404655f10684ea9ee57d4f370b44653d35159
font_02_sfnt_off00013ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC6 16532 bytes
SHA-256: da87cd67198c3b3599a2e6989a63d96692c499d6a8ce8e189b220248c84ab53c

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