Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b777a97fd093f9…

MALICIOUS

PDF

95.7 KB Created: 2021-08-09 19:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e523421c4e2f72c2610a3d4780cbe56 SHA-1: 5578908a714b6510155495b309e02669bf473e8b SHA-256: 89b777a97fd093f9bc46a00d1848905f10bf2963658bfdc3a0bba4973c81ffad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous links to compromised CMS uploads and disposable hosting, coupled with a lure for downloading content, suggests a phishing or malware distribution scheme. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=pocket+ants+colony+simulator+mod+apk+hack
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161006203dbb4f---bupedejopokunotum.pdf
    • https://seeandhearbetter.ie/img/shop//contents/76016616149.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c26780b7ab3b49b7d69994fe7c9612a5/xuvurisebofevirobune.pdf
    • https://pima-alarms.rs/slicice/file/12217252400.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945180b4716---kexidizunefebabujigebemi.pdf
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/ponetijajixuwur.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b08bd324---19395892605.pdf
    • http://amandatravel.com/userfiles/file/34447319944.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b2b327af9ce04b92a003539e470eb6fa/43401946977.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d94921a2e2fbfcfab9b95d2d59ab80b5/63568814938.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/r7m57vfoic9lephgkceegcrcb9/kutinir.pdf
    • http://architettoletiziamasciotta.eu/userfiles/files/51255329081.pdf
    • http://xn--nellieskche-0hb.de/userfiles/file/tiveximim.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf9b5025e---xidaka.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/6949096bbed9cd6e27e44a416d595735/pibado.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/11322aec520c15c6e29785ede2b2dbae/gokuvafet.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/12c7012663f3d0d27c9bf269557b2d01/28495686944.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f80ee5942---71709163903.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d262a42961---resiloronemuxa.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-8-5/20210805074428354829.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/h5apan1elpgcncapii970knuhs/75304286098.pdf
    • https://xo-sound.ru/userfiles/file/juwasetefigutitelerom.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/52900428311.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f193.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 16792 bytes
font_01_sfnt_off000109a0.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 1692 bytes
font_02_sfnt_off000111a4.bin
b1c0d6757c0f9d7f01841100f3efab1e5b253801d08448628f944bcbd4ce09d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 17096 bytes
font_03_sfnt_off00013ebb.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBB 16164 bytes
font_04_sfnt_off00015432.bin
41ae0dc9b0b11ca15efed20fdf2da6823be980537baa9854ec93495a3910fded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15432 11088 bytes

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