Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3ce55335cef3ad…

MALICIOUS

PDF

83.9 KB Created: 2021-07-09 23:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5de53acf6d4b04b94c23a3785aea729a SHA-1: 8c58ce78944f9c059707f56a703153fd31f8e419 SHA-256: bd3ce55335cef3adbfa9ba13231c3652a8979f47f1f84ad978fb8bd7abcb67f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This structure strongly suggests a link farm designed to distribute phishing content or malware. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the overall pattern indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nepalimodelagency.com/userfiles/file/43405597366.pdf In PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/r90kl06tlc1pm63ihr8nemds47/72953618461.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/45450664893.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021052506224436542.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b481dcffa53c5d7922e02147dbf9811c/kitoxorew.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160803e34a0cf0---wakojafase.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f743ae79d0---33225718941.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/sviepukqhu8qp5b34fi1dt0ea7/judafeguwajuzupuzo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2acad20f42---88472270357.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609428771d530---88585549579.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/76301020783.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f14d1de15f---naninisudefebuni.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f80d32f24d0562129119136208ffe4d4/bokapuwu.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/79652121571.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/ruzoleliwitexifewubigoz.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb9170fe3d---61427831933.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/19b9a66d090de062b69731f5278637a0/51790440998.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/97523273576.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/bowujefemusuzefevapon.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/gilugigosokodesisiserima.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609beb9c60f76---vogulojivufozu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae2810f10---makobutir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=occupancy+meaning+in+hotelPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/27336003238.pdfIn PDF document text
    • 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_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 17312 bytes
SHA-256: ce0575dd96fb1b43e4d02534b9ebc22a3a1c3d23f352fc9eedb9bc26e31a82c8
font_01_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 10792 bytes
SHA-256: 81b9b9c48002deb1e6df862b7d3814055294491404850c338725b8078d05b4b7

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