Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4ba2f62be918b9…

MALICIOUS

PDF

86.4 KB Created: 2021-07-03 17:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 906a25641e505d009a79150a3adc554d SHA-1: d6be91c33815a579e956de0538ce5c3785796ab0 SHA-256: 4d4ba2f62be918b9c9dda76eefc05fd14d179598b34c2111341dd97c9362ba91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://audit-advisers.com/userfiles/file/82950431668.pdf
    • http://ecohost.ru/pics/images/file/47634418783.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609451f5ce648---12130171324.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/5d16m38ga865g8hsrt4fe1bdup/26308113330.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb0ec7e97---92070375251.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/a5bbefbfc02cd2a1759fdcb203ce056c/zaridexan.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e40fabc2a---32510916929.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160855c2d288f4---nutikotitamenogosoj.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608f150a3cf51---deponoxonozejoniwuf.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd0142892c---87029973919.pdf
    • http://chroscina.com/userfiles/file/52921981459.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a608dc2cc7---pejoronatusaxetituwi.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/aa5f7c252fa08c391dcf9c303d219647/zoxifibunimadorikub.pdf
    • http://seoulmenu.com/uploads/files/rijesa.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ds23vl04135vlib8q18p48vkl0/jonosuwilelaralolapinako.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/c06fc4f4b3a35d6ce1bea060c0435372/2683367102.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bbe903382---guxugalipepubosusaxuwu.pdf
    • http://chnli.tw/CKEdit/upload/files/44232036398.pdf
    • http://ridendo.cz/files/file/gesewagakanazajunerekoro.pdf
    • http://szao-spb.ru/images/news/file/rosemuzejegudejoju.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b79c27e8700---68210517867.pdf
    • http://beloezoloto.ru/userfiles/file/radakivosir.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/45ab178647e2e1b03ca037f3c8a0bd71/84692007832.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=multiple+choice+questions+on+food+chain+and+food+web
    • 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_off0000eb63.bin
ae273afc0d26982e6e27fb89dc628ebfae97fdca3af11a142f3a95aa7f551bce
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 11084 bytes
font_01_sfnt_off000104d1.bin
d5ae0fd90b47c64671b706f1c6e5d3c9ba59f11ec9fb7ebf24eb812c0ab460b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 17776 bytes
font_02_sfnt_off000133b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133B5 16792 bytes