Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed33dc9de4ccd4b…

MALICIOUS

PDF

88.6 KB Created: 2021-08-19 14:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d7a54dc5f6ec81ac9134e48c2deec730 SHA-1: 2a63a142e196b1f1ff8ff463b9c8ff7e8d031c9a SHA-256: 7ed33dc9de4ccd4b138e23b80e3d0a11efc65c21c0d63a9424ca5ca29a30f84b
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness, with the PDF being identified as a phishing trojan. The presence of numerous links pointing to compromised WordPress sites, disguised as PDF files, suggests a link farm designed to distribute malware or lead users to phishing pages. The document body is unreadable, but the heuristics and URLs point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/7dfc5f2ff7b4552c275a5aa9d4176e7e/5182728866.pdf In PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bed81d717---xutakefebago.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/474737ee5e2caeab4212aa1f0d62a83c/lodonefipusuvogo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0369e9ad75---21271769747.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/49380725847.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16107c45047598---mozudatalodivu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799e1b3a3ae---wasugole.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/48863289292.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/17088901410.pdfIn PDF document text
    • http://candientushinko.com/images/file/39173637260.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/69249821989.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/luzuxofuvuwimiwo.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/temogebefipasuj.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/49009f2b15ea2e1fa576e9c365adaec1/waruta.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/14916737814.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c271f4c989---82016403126.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/f166cfbd4fd946e1c8491424122dda86/28806477897.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/gemewuwodotawirenoreku.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba844de5270---wakex.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ff8443ff87d311ea8463be8da70636af/18578615257.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/70393422024.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/lutetabekatetifopobozaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=imprimir+talon+de+pago+del+fonePDF 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_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 10624 bytes
SHA-256: 668ea1b3e91e12335cbe98bd297835aff612e4a9a4708d2c40ef04f171bed932
font_01_sfnt_off00010fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 16932 bytes
SHA-256: 97dceea49689b425a99144f34a15055e9e0b49fedb97d1fbb85c28c089aacf26

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