Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4f98ae19356a53…

MALICIOUS

PDF

95.4 KB Created: 2021-07-24 05:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bba3c85e79fd0a5447f646c8cbcd90ff SHA-1: 82a3e51f1ed5f3606e2f02de8f4f3c393ddd46a6 SHA-256: bf4f98ae19356a53745dc18d0f9c34b642bb960f45864e523c52f6a22cdf86d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The document also features a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/05701f07265e4fc36f4794f4705c77a0/rinojavuxubusifofaxipofus.pdf
    • http://koreadramatour.com/FileData/ckfinder/files/20210710_94CA3F917278AD20.pdf
    • http://myucmas.com/userfiles/file/fomotamalezokifanupizote.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffeb7a669c---61267701268.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e0e91732ee088af9e175d05dd9d58131/nijanigowedojulaludax.pdf
    • https://betenrealestate.com/sites/default/files/file/pepavigelomiwiwutaralewal.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/t3l4j58q423st266qhbpcloh2f/nijiwogafi.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa294028f7---33048848856.pdf
    • http://snotlicker.com/clients/10243/File/45143600908.pdf
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/5497186175.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863efe35774---2615719886.pdf
    • http://kryotherapie.net/neu/userfiles/file/ravib.pdf
    • https://discovercefalu.it/_data/images/file/nopekanuzipu.pdf
    • http://stlnsk.ru/uploads/file/80723124109.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1956d9c49---pepazure.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f5dc399a91a---juduxedit.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/1b82e4444045afba855bf106fbaa1704/vibawexibokeb.pdf
    • http://imhkayseri.com/resimler/files/49864369029.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/f9b0b5f8c8a8ec9bb7293032f0837b24/75198910919.pdf
    • http://inlygiaylynhua.com/upload/files/30927303931.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c76bba5c7---41561085933.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/ad03cb563e86adfca7f6190ace693c1c/movigoki.pdf
    • http://khunghinhdepphuctin.com/media/ftp/file/88983004278.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/377c653b12d41fc73814745a12b6bd5c/vaxenuw.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/14649e4c77be05cc2b000d48e3d8460e/tomaxupigavebo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=project+proposal+example+tagalog
    • 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_off00010fb0.bin
5e860411d2aaa2288ad76b9c597a8cc38cffbb649ad4efd1050d75a47c8162a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 10756 bytes
font_01_sfnt_off00012896.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12896 16792 bytes
font_02_sfnt_off000140a8.bin
3c14e8249e4673dfa565b3fdccc87faff0cd55c9a1ed41c2a685ddccc87b0412
pdf-font-stream PDF embedded font (sfnt) at offset 0x140A8 17556 bytes