Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33c19900b8fe715…

MALICIOUS

PDF

86.7 KB Created: 2021-06-29 18:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d69f67d8c7b9a9a5109e1f31bdb37f90 SHA-1: 1b5a92e74d907a7b4d4364aaeec6d93b71df744d SHA-256: f33c19900b8fe715be70ab3028a9c796578972d8ac771631157f2088d7b262b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://africanresearchcenter.com/userfiles/file/vokarevavojakugopa.pdf In PDF document text
    • https://alamansyria.com/userfiles/file/24298306291.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/mixupakesanawex.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/cc0c3d0ce61c28e363041b169dfcf2d1/29826330635.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab9d214b4---83908207180.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/cdcb1c610b0b9c92279ee417cb325c34/tevatekojobogavekikil.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e44a77a6c---20504547308.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/75638479455.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad305498640---58433611944.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078928fb8734---revasijofarulesowonawobi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ku8ptmbdcrua8ng56gsq56bhnv/52721048825.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/29583764127.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d14d1f445---wimakapexamaxa.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fcb88676a---kameligeniwaf.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/7750614898.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-27/20210527221234746664.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607107a589aa6---lipaledenedufoxib.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a01975a00---70852800496.pdfIn PDF document text
    • https://2acontractor.it/images/file/25902147205.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/23083649874.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c9101b2c0920de038facde869100c4ec/19247317046.pdfIn PDF document text
    • https://htchninc.com/d/files/15744555252.pdfIn PDF document text
    • http://momsystem.ru/public/file/rurosixinivowu.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/13339614132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+many+levels+does+candy+crush+hasPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 17000 bytes
SHA-256: 4fd618c570ea1df6fd6d6d0d77a2eb19ac496a7e806408c31a217d3c7b7bc87e
font_02_sfnt_off00013495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13495 10804 bytes
SHA-256: 154742967a0b109d0e8889dd6bbe21bd0f7dfc92037abb68c3582859f68106be