Malicious PDF — malware analysis report

Static analysis result for SHA-256 880731eba611571d…

MALICIOUS

PDF

88.2 KB Created: 2021-06-30 12:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa075daa2227b8f82d00609422b833e6 SHA-1: 24771294b63bd1b71be76d77d93b2532a1f35a7c SHA-256: 880731eba611571d5b0c8137f8af6003be301525bae9bd8ce2de57d3bfa95b3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072de25e0caf---vanaz.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/cp6anj33oun9man5lo2hms8hm4/85010019590.pdf
    • http://www.tobywells.org/media/fckdir/file/zofifawu.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ff0c63a92---madivofexipenolebiz.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b7e6a0577---mezefiraguxibumoko.pdf
    • http://shs1977reunion.com/clients/41590/File/tokijobasixofimer.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b568b24e5---16459113180.pdf
    • http://amandamaitland.com/images/file/kizisidinogovaguv.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d686b8d9a9---siwudulejovinokaj.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2fa4ca434---84371289995.pdf
    • https://sportsht.com/userfiles/file/42130338877.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/11ccba56c8d4370062f549562a2def1e/98667126633.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098bad5c95b4---gitumezobemajovejefutiko.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f764ac3b27---kajaromekunigereke.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609286aed8e74---sawidukilisorifupetiteluk.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f87ad76f0---fuxon.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/6c086adbdccf549dfd05c45f46e799de/2534337479.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761d603de81---diwefovefoxenud.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/96fb6bcbe4956fd714a554ed61a6b1df/94897909238.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/c0e9a8deb5cea6fc69596c2fb51eac21/xavijutozupasijor.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988deabb64f---41031664688.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5d6b22f46929865470679d06b27a2627/29725970786.pdf
    • http://ikuma-car.com/js/upload/files/tozemogudit.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/917ee490d895cb381a3385cfd7a99d07/rusebevame.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a3d3b257---85286808413.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=midwifery+and+obstetrical+nursing+books+pdf
    • 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_off0000f41e.bin
7d3dc4a498810826dad2669159ebb3a8c43311de3f7ceabe86f7cc81147f2326
pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 17192 bytes
font_01_sfnt_off000120af.bin
41b740285fa6c83a667f2e2c15f6ec86d3f630a961954c9f1eb881b21ab3c32b
pdf-font-stream PDF embedded font (sfnt) at offset 0x120AF 11320 bytes
font_02_sfnt_off00013b1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1D 16792 bytes