Malicious PDF — malware analysis report

Static analysis result for SHA-256 f532e4f5a2e43e9c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-05 22:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ff16ba16732dc90e22dc00e32d72c789 SHA-1: c58707446a0478ac7b7039b47a7c1733dc82265b SHA-256: f532e4f5a2e43e9c1e4ff7297064de937641e4501c24d512f38704c6d8033a88
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 links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a phishing campaign aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=how+do+non+flowering+plants+reproduce+pdf PDF link annotation
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec7b28fdc5---23912208291.pdfIn PDF document text
    • http://sooclose.eu/upload/File/rigejobugajuso.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/88074338795.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/70949642704.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/ganamipesadasosulabute.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16112ba557f50d---zedoxe.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160778955544d8---72214397157.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/92836614336.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/ralosim.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/54705e1f179e91066dcd9939f8c37108/zominoresoluta.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/91434075350.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161255a47a219c---josejimarasakasasipusiton.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f50a5d7e5---66190771886.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/xarowuzevisixasozaz.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8466bc37b---karederojojovevemusowob.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/35491687894.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/43744855586.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/53807634304.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/h51p9rrh71f4m3nkr0n2qgfgrk/76586081338.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/velafitegizo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839c5519df3---7044524528.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad91506cf4---gixoburaziximivadenosote.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/h9q454juec0jj672n7vdbg5dqk/71347924011.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/12472806830.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_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 10972 bytes
SHA-256: 0cf697368ef278c4d2d845bd64cf39d56fa52fc71ac46489ced227d2e4f381eb
font_01_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 17640 bytes
SHA-256: 818edd61c876edb82cce9cb1472f8a8b4c3597c2ad86c5b568d569630ef48ce7

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