Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5884be54c59890…

MALICIOUS

PDF

101.4 KB Created: 2021-06-30 12:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9889f45d8e3163131a19659974e27862 SHA-1: 9182ed42eb7136a4f3e5241ed92be739c339d943 SHA-256: df5884be54c59890df3b9a5350b784d6a0f149ae73f5395de2d59c13699f2871
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/sjlpigbeoqkj2hlibnqlu1ntn5/91192268211.pdf In PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf52a40f6ac---xorovoseguj.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e3bb4defd711847720cfa93acf52b507/44913200518.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/46222507807.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/toderiwabubijimabegow.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/53239383068.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/202b948f72c554f17d0a319f841b53bc/tobelabukofusu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20f153572---70764414811.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/910f837bc8fc568196902f18d7bdeb9a/4530134408.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/r9m31nos081il97pugcinhtkvl/69950262848.pdfIn PDF document text
    • https://lemanssrl.it/file/tumoligefufuzebunim.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a342b00474e---60689054171.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/da90248710e151a6104af9806f8f7ef7/33057290198.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919f47bdf9c---52215920223.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3edc12ea---xisup.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/mojiruna.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caab8010045---rojafajenuzupagajazu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609189842ab75---57298331656.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0ee7cfa75---bewaxigib.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/kibal.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/28328381894.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/vixewurejevetifuwusubagor.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ce13b6c0a---pedoxovikowipinedeperebi.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/44231222680.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c39fbef870a8f579bc1591296a03cf71/badapaxoruweketuperate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=simplify+square+root+of+28PDF 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_off00012668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7F 11176 bytes
SHA-256: 4ec53749d23e56507650679a9ab8b4ed59fa8f8aad6833b54d8e606a9ab72f77
font_02_sfnt_off000158ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158BA 17708 bytes
SHA-256: 66066945f4ea2106606056b6633a02eb0c6984893a599caab55ee5d9d146f397

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