Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8794f18d4ab62e…

MALICIOUS

PDF

88.4 KB Created: 2021-06-28 08:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04f50b8b86b97766eae4504f9d08d13f SHA-1: 8400e9a9c68d933559d49dcc496b24d12d356ff6 SHA-256: bc8794f18d4ab62ecbafdf99c1a331f5518e0c4c49edf208caf5434d1b65077a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The file's structure and numerous external links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://doubles301.jp/files/ckeditor/files/73297710053.pdf
    • http://clasesholandes.com/userfiles/file/xubokiduzosigopisofukivu.pdf
    • http://4reality.cz/userfiles/files/bugezuzow.pdf
    • http://bettynblue.com/upload/fck_img/20210513/file/jitefozifib.pdf
    • http://cn-junsheng.com/upload/file///202167145874116.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/taledejaliji.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/3f581498c35ebd5ff5508aff4b483187/puwifitupofejoko.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ke7l64s5e7an1pfomql77jf8qk/30265766638.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1e19cb78868e98452026e8b600213ec1/13773245433.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/36d6e5ac1e1a42efd536bd6f3f872fa3/dumirotasazokikegudirot.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160becb43ea48b---32920050790.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989bcd00b18---53637358806.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mgksh6cdp3h7d42ehtabh9bmvm/68885639244.pdf
    • http://brmhn.com/userfiles/file/20210624122137_r1bo1x.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/854d20be5e7761294b41119ecf81f419/mubazerusavinino.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/2du509miqibfha9jv750q90pr6/lapizize.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0b29560cdb4dc28eefdc3bb48c874759/vexasutamosuziwipur.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a12195586---nalexisowavudu.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/7794855c41f25cf9e2413c4013c03cef/tuxepiwo.pdf
    • https://alibabaoman.com/basefile/alibabaomancom/files/poxujusiramofon.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d80af3c9a5---vigaxobibum.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=break+even+meaning+in+tagalog
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f42d.bin
f0e66649d48b8c18b89d048d88dd21b10d330347d605c4f588e63c8a2aed20b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 10492 bytes
font_01_sfnt_off00010c0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 16792 bytes
font_02_sfnt_off0001241d.bin
b8fb27c1160a2e162c71381c4df2c906a55931b8e42ff743bbd9fb93d8bf6b42
pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 18260 bytes