Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb6ca4aaa4e0d9e…

MALICIOUS

PDF

89.4 KB Created: 2021-09-04 05:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a32e9d35b405bc4b799afde4080811d2 SHA-1: 024833df2c2914326bd0bce94c1d41956ad0a0a1 SHA-256: 7eb6ca4aaa4e0d9e863be87b1d7a6a4358f6030bba789546ec43638e6ef195ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://paperland.bg/uploads/file/56088447304.pdf In PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/4137184881.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/96892767651.pdfIn PDF document text
    • https://campermagazine.tv/public/file/13328421388.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/48536058192.pdfIn PDF document text
    • http://klefmarken.se/upload/file/1991717281.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/41d54b7f5247ebd7b37d4804d3e5c631/govoruputixipabe.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/gagamat.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/24401286575.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/36d4a2359e6cbaa3ed58a37f1e067c71/70330577520.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b3421476acf2c84d52a18a55a984c668/66122692403.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/2e5ed28eab03f095fcd4c041b30e33fa/25458467766.pdfIn PDF document text
    • http://esistore.be/userfiles/file/jupiwazirakalu.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/cc4db59d0fd572fd2db017e65cf21986/38264083923.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/valibe.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/nabeleregesow.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/r9ljs2gi1gqb954ec0j27du93g/kabigo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933a3293d03---guropiv.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/labemisarapixudiferekawaz.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/lufafoxerewudegatanizuru.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608091e10c59b---gegizegusazovivulalejesaz.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/59698697845.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce1e0c42e---gurave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bumboat+cruise+on+the+singapore+river+pdfPDF 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_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 18472 bytes
SHA-256: 7a1988a9ef8c1189a705abeac373770dcd9d4fdf751d9d2d0ada3b57f6c4830b
font_01_sfnt_off00012578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12578 11380 bytes
SHA-256: 91d81dbb6f8fe1c599b223c6e0aa5692d26e829db7124b8905d09129ec83a324
font_02_sfnt_off00013fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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