Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1c2c5796f5ffdd…

MALICIOUS

PDF

233.2 KB Created: 2021-07-02 10:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5bee8af37f7ec96d1c439e62eab26749 SHA-1: d9e7b288d6ac4526584554ab6718a39463a16dc3 SHA-256: 3a1c2c5796f5ffdd550b41fcc10ed8b2ee013dd3a8478ca517cd480551c70a8f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one pointing to a compromised WordPress upload storage location, indicating a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of a link farm and SEO redirector points towards a social engineering tactic to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9326

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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 http://mujuerp.com/uploads/ckeditor/files/20210628021512.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854c3ee1d52---86950712943.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/dbnthpr3lls5qg3snhqar3jgap/matalemidateresaw.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/65233533557.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084dcf7a131e---26833994711.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd71c7c3c1e---71181484249.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/dazexakozer.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/22a3dfad24c9c3f786189b4054f015dc/69404040223.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/523vohjdcn25uik1tmb8o4sae3/81248605979.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/p32sd5arifgbfv45fa62gb8gfm/23104457736.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608aae30e6587---fasipebolegafojemokulu.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/d01fa3bda014f3dfc26ef37029871fbd/14282824399.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091b0261d178---zagosupibufozuxidunax.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607da27c61f6b---97116708182.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/91717815359.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f7752f797d00f343ecba7298196d5ff9/xuguvovudam.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160857b8437ffa---88853995081.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/48cqksga96idgkq346gqed2tp4/gesoforukebebel.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/9p6gfcfcmkovav3f6can5uifv4/josuk.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b073c6e77---ronifemozuwuvuk.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/83825119577.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607998c73cb8e---10876076395.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b681f9d4abb---nagijegilet.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160856c2078080---47202230888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=monica+bellucci+mary+magdalenePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00030497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00031ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31CA8 16628 bytes
SHA-256: b8bf60a4c88af9139de3612d75246451a8b77a3df1a530117908d12cba4676ce
font_02_sfnt_off0003342c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3342C 3960 bytes
SHA-256: 9e936f96238fc81d6e29f64d2a8dcd458332a0205c41aed82f514e34763d97bc
font_03_sfnt_off00034369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34369 24468 bytes
SHA-256: d0e0f53000b4bc6412536bd5e5bd541e2bd3f5f054eac5c9c5aff4e49887c6df
font_04_sfnt_off00037d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37D38 10792 bytes
SHA-256: 7c8380f81ae166dd321e88dc015ae627ccd3dcc4cc5e09f27ded0177c32a4188

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