Malicious PDF — malware analysis report

Static analysis result for SHA-256 2595395ac8f01206…

MALICIOUS

PDF

84.2 KB Created: 2021-07-04 06:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b64e120e60524859bc1139a309f424c SHA-1: 739d50de7d6d2498bfd458420d70ea320b84be66 SHA-256: 2595395ac8f0120640a59b2347d3697eb0db054830218481e6cefa0c3b22177b
134 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The PDF also contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9856

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.
  • 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.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607267a602bf6---jolovagadetoruramipafuza.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e6b3e1afb---berakipepaxatajusame.pdf
    • http://musclecar-taps.com/js/upload/files/pifubodisanef.pdf
    • http://tourister.kr/userfiles/file/xozinubakesopuzeva.pdf
    • http://crmrealty360degree.in/userfiles/file/95869329407.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f9c13ffe---livepazevenadetizafoli.pdf
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/82354000294.pdf
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/kitumigimoxuwagobu.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/c738dee88b63c48f2b43754b80f78fa8/53488060554.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97a12b3ab---3472691053.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bc02023fd4c---rirafugutim.pdf
    • https://akproauto.com/nbloom/fckuploads/file/95105395983.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/43abe77483e6d1cff45b55522546e8b3/tevazumileduzan.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941d8ca9d9c---purira.pdf
    • http://fipjp.com/userfiles/file/65765101764.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3a2d530579c218a9460078172f9c327d/muvenuramapodagidejavas.pdf
    • http://ecole.ru/text/images/file/labofigazegoser.pdf
    • http://zuche0551.com/upload/file/fokitunaladozovanopo.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b32c9650ee2---xepesivasavetoxubifukali.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab62be7eb6---71022206021.pdf
    • https://kovosluzba-praha.cz/res/file/29809451408.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16098442fe9eae---dekadunikovigaxofadipaw.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/1hnkh4aif3qvpmf5llfjmad686/gavidifawomasawuz.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/q1crn7vl3319vlq5c5cm6rp35u/1375418420.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c2093cb71---89494850825.pdf
    • https://fertilizergranulatorprice.com/d/files/duzim.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/63cd0262f192ff14086e64c2ad9d82d1/53357093629.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5b562fd8aa53fc17cb3ef7f30930b231/96926770584.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=3+laws+of+thermodynamics
    • 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_off0000eb10.bin
889dedb100b0dabbf70fe15f35de7b98562352584202cbd72a26c468420e9eb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 17592 bytes
font_01_sfnt_off000118b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 16792 bytes
font_02_sfnt_off000130cd.bin
ed81b7e0aba61627babea27794d745e9331cbd0b8dbfce2e2f32b606948317ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x130CD 11016 bytes