Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4a0b4c879e7219…

MALICIOUS

PDF

84.4 KB Created: 2021-09-14 09:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b81639961d0f64c690ab33dce0e893f SHA-1: 2013a20136f69c5bd31bcf6bb3a4a809b51bd034 SHA-256: 1f4a0b4c879e72198e365021198b90aeae880abd8f869ba981436a39d8160527
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://huefpdf.org/upload/file/71074857190.pdf In PDF document text
    • http://cokhilegia.com/upload/files/98218224781.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/5728066130.pdfIn PDF document text
    • http://rococosofa.com/files/files/25236690575.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/15120275162.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/fowelilosotenugem.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7fd55a828---wesutojota.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/27370514180.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/pirerevalogupe.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/lokebuxozawafoketojot.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090615054580554.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/jobabikelaso.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/37413552875.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/53869899755.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109080551475719.pdfIn PDF document text
    • http://japhina.com/upload/file/jokobilamiwisidiwuzu.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/627300335e68bae01dbcda801728be6c/44887435188.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377b79b425e---megarafoge.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/43784065349.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/54632221106.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/xigil.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bbd39ece---75736483520.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/rofik.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/kuluxufaxu.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/75769000600.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/dizojeserepobesolexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+can+i+watch+zombies+2PDF 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_off0000e4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C1 10744 bytes
SHA-256: bea481fe9bebbdcd9667d9f7fab7243944d64148f11b675b06721540aa642078
font_01_sfnt_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 17988 bytes
SHA-256: fa2677e566e3c36e9a1c11e0ff9b5728d7770ef7f712c13ae8ab266a56c9053e

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