Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d4b14acb7976cc…

MALICIOUS

PDF

84.9 KB Created: 2021-07-18 07:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8e919a4fbfbbeff7050bd0768da7c21 SHA-1: 7c1d4911beb884aed5298162d7341f77581f7741 SHA-256: 05d4b14acb7976ccfcda3e46e1767380e63c542e79709b7ae7d9af03a9e21bc0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae026aedbb5---vudoxizemobajewozibo.pdf
    • https://parklanehotel.asia/userfiles/file/97266431300.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606da74f64656---64711122983.pdf
    • http://lateonsettay-sachs.org/userfiles/file/80142751849.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f29cfb48948---74204137268.pdf
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/rodezubewamibif.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc929e5d91---koromulopipa.pdf
    • http://huntland.hu/upload/file/70384945303.pdf
    • http://jhferry.com/data/fckeditor/file///58866654831.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/47592270084.pdf
    • http://vetcarefoundation.org/userfiles/file/67462972899.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3b73bcb21bf327cf7a729928dbff7db8/41279971207.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/r0nud6v4kna20vhiufmoq6f4oq/80137123216.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b029bfd22---vejivu.pdf
    • https://mdteam.se/ckfinder/userfiles/files/luzasurimolokaj.pdf
    • http://krevue.cz/UserFiles/File/sugatolisuwuvodudote.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4b706a383a29375fe08b2edf5f9fc423/44120487540.pdf
    • http://ebslang.net/_UploadFile/Images/file/87110183633.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/1bfbec6ca97041fb1e65946ee050417b/zinorefekerumirim.pdf
    • http://ecohost.ru/pics/images/file/85164459708.pdf
    • http://nfraccon.org/userfiles/file/32048682212.pdf
    • http://afghansolar.com/userfiles/file/7447373002.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ef161493d---tuvolajij.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e44de6539266a84913baf046fb9a941a/gexakuto.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=florida+real+estate+final+exam+answers
    • 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_off0000e675.bin
72cc6dfa78302043420d845863087b84a49a4e436dc61df1cb113aff8bd12034
pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 10680 bytes
font_01_sfnt_off0000fef1.bin
67b9bf76cb9bdeed1dacbb7bb0eab597261a724d349dc1f7ffc97dbc80fcb6c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 17996 bytes
font_02_sfnt_off00012e2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2B 16792 bytes