Malicious PDF — malware analysis report

Static analysis result for SHA-256 931ccdda0f789105…

MALICIOUS

PDF

85.9 KB Created: 2021-06-29 10:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75e43ec21ccbab560ec518db53c3b83b SHA-1: e28141c40fe1be08885ab76225cbf4352eb0cc70 SHA-256: 931ccdda0f789105a1ed0053681031c9ba29c8e7ae7c35bd59d55b1c8c14a888
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous links to external resources, many of which are hosted on compromised websites and point to other PDF files. This behavior is indicative of a link farm designed to redirect users to malicious content, likely for phishing or to serve further malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3f21b51aa61cce3092d89c077caa4130/mulejuxubewomos.pdf
    • http://montaze.org/democms/userfiles/file/jilijulosituvepokos.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/ruruguk.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aba50cc37e8---42474306591.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/967438640c0ada92dc079504678537ae/88829912587.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/952167e719cf4de814ee6b5744cf054d/xedegunanukup.pdf
    • http://dlevitin.ru/fck_editor_files/files/piruxoziwazuk.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/737phh7mvuapj69v2mn8647hh5/nalukezak.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0b4313f2---mogub.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/70263385245.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe7fa16b0f---naterawadu.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/5bhbhsnitgq8roj0p9ao0mn111/vijuxotarusozo.pdf
    • http://gmkms.net/upfile_editor/2021/files/xadepalubimujovudazedulab.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086fb7bd2fdb---14159326212.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8db3bfe34d6cfdc00aeba4ae0f76f867/gitakekozovulemurelide.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/q4rrjqske0as0tv0uhfd0ivhgn/jelopigez.pdf
    • https://topinsolventa.ro/userfiles/file/45833984737.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4949549e1---lopotelawiwadusurapo.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774c9080b3f---82993348317.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84f3f3b5e9---70052037206.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb6774a5d---kepodabonedosogukujakasi.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77cf57549a---35796069631.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907f42d7766---15329535471.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/9c971ff75a2c329694dc9b253d255a3f/45865437442.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad650125b73---4945993.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cooperative+learning+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_off0000ed23.bin
5c25fc9728b54cf7f5511c50c2b576aadf6b249b91440ab69902260a851851bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 17072 bytes
font_01_sfnt_off000119ce.bin
06d4c5e66fda916881df794ac5a1305895727e41c1be0ae1459bd4ec3614188d
pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 10604 bytes
font_02_sfnt_off000131ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131EF 16792 bytes