Malicious PDF — malware analysis report

Static analysis result for SHA-256 a473fa79f79fa710…

MALICIOUS

PDF

129.1 KB Created: 2021-08-14 08:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99f4f76cfe150666ef2557e81a9bacf3 SHA-1: 2793c422fa2834b7df98c6b09c70e6f4b475e434 SHA-256: a473fa79f79fa71041498fd541d751c66107e1dc0520e628d0bcb8205f99bd69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://irlanc.ru/uplcv?utm_term=surah+waqiah+lyrics+in+english+pdf PDF link annotation
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b71f0e052b38075f06e09d4188f96661/ruxufakezetotadojikekib.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/tifewubog.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5f50b218d37bdc3c9d6602bb608cf366/25290586902.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/wotitewiza.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8619d2e6e---karamarewasufovu.pdfIn PDF document text
    • http://simonide.org/userfiles/file/gimoligusojesiwudil.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/21955633751.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/47098698383.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/80629723829.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b508f133751---togafebuzodikitibu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e904780a7e8---88635823997.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b1169f4a---tunekagakir.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e3a03ce09c864717e01716e905842102/nosowitatadosa.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7b96246f9382738e4174085bf8609b89/koguputofoka.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/buforisexodufaj.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b7f5f0913---17657963812.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3eef95fb5020ebeba4b716b8796cb1b7/1030190986.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fc64f3e3b3e2c3b67cdfd6d8546d7baa/jakugavodeb.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/molojavaxizarezasizikotam.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/ramejade.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608001e53e44c---29716577138.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/59430758284.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001b6b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B6B1 35084 bytes
SHA-256: f10c9c35c91fe10552881098d95378e699dd61ccc43a6e0f3a1c97638c333041
font_00_sfnt_off000156aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156AA 17900 bytes
SHA-256: c86c463e2a9a9b7c7300b6e03b465dbf58bf8626b1ea0c5ac383fce33b7586cf
font_01_sfnt_off000184f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D0B 11204 bytes
SHA-256: 5f3e59b7568d402c70333dda6a3459f61683584baa8177b9563a78f4683e6b45

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