Malicious PDF — malware analysis report

Static analysis result for SHA-256 308db29cb8d7c83b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 22:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05670edf9a31eeb3ea98d77884b4b353 SHA-1: 5c3eff3d8e81d7952c93c47759aeaaf266b618ff SHA-256: 308db29cb8d7c83b878d8397cdad8627449b71863eb8e3270ea15b1c360b3ec2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites, likely intended to host further malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=plural+form+of+regular+and+irregular+nouns+worksheet+pdf PDF link annotation
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f4b7236a4036c97fa85afe7b02d87a1e/99032521088.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a5380413443ba2555feb28f4b6fe3b0e/62571590116.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/28082035817.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/58880695609.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/bimek.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53221287190.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9e82367f7---78045279340.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160868a2825800---25988485407.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/88777988442.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/5224711263.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0a7b124b1---zememotetodivon.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/75116562969.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/juwenixavazase.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/bejujupazilog.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/44922716571.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/95132847120.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf143b8c1fd---31508510829.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/41953244290.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/28469114743.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084e602b4c49---42328250605.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071872918d82---66382122545.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0a334a1e6fe184ec507b52204dd85b77/diruvawejezobuk.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/gojowugajigur.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_off0000cc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC70 11224 bytes
SHA-256: 37855e28d3669a797113645979e5ac09a9d1f28305e743121007eae885f39360
font_01_sfnt_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 18788 bytes
SHA-256: 6a08382fde0e2b1fe9972fcecf85f5f3d686042b05bcaf0d7c52f36f24d86bef
font_02_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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