Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b53fca56cf8413…

MALICIOUS

PDF

81.2 KB Created: 2021-10-06 08:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1796981f08bd14f0f052c98468225c9e SHA-1: 1bb0cf4e920bb532615db068dc4db4533d377f03 SHA-256: f8b53fca56cf8413364b9bcabe32c14b86ff4121731cbde2f4b66bc25c96c012
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pixomot.ru/uplcv?utm_term=asp+net+pdf+for+beginners PDF link annotation
    • https://turystycznapodkowa.pl/userfiles/file/27182130077.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/gigobokusu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613682b5aa7a3---65289206534.pdfIn PDF document text
    • http://kahasat.cz/data/file/81922377699.pdfIn PDF document text
    • http://lesrimaudieres.com/images/uploads/file/60016842849.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/a54dfe9525894a2a7f1670204ba51b28/70064756195.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/51987710995.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/kedisakevitisomake.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b50fc6a7aa---88692693239.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03a3817e3---49878998975.pdfIn PDF document text
    • http://jucal.es/images/file/77234669008.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/fasugi.pdfIn PDF document text
    • http://idevoz.rs/files/malobedakifomomexi.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/33233752577.pdfIn PDF document text
    • https://bfull.ru/uploads/files/38211443700.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/nanulenigeginume.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/34177809489.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/28679685662.pdfIn PDF document text
    • http://infunplastic.com/d/files/tumijivozepurajodotupu.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/70095148726.pdfIn PDF document text
    • http://contelex.it/userfiles/files/58895898590.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/foradewagopubisun.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/10709258023.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/17300121492.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/sijobilemobinev.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/39816020763.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/53889785309.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_off0000d2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 10584 bytes
SHA-256: e5a15958e4d535688395f8723ba1f2ff0d6c8783f9e46050fe9837f5b08ab14c
font_02_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 20012 bytes
SHA-256: cbef179e9bb0d0ee3392514b63fc429594409a8f75de61f03277e261750af396

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