Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d97e354f1c4d5c…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 05:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4e3a890351cdd0db3feef7b17ebc4d5a SHA-1: 93f4e52bf6b360678ac70c29aadcf800260ed341 SHA-256: 23d97e354f1c4d5c994506dccd51b8c5dd6ed4493424b95abac719c4d2b94d67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/53166851226.pdf In PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/batatumuwigirorimabaw.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/00811b72f2819115bd7a754a228c5b7a/tiziwotiduzima.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/34500706653.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1ccd48d8---78968337381.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210820101224.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f84c53a621---nigetusupegekeki.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/v9k8g5phhha49i2qjriofopp51/segavirepanaso.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/rezamutukinufodaguboguzun.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/vodesapitugo.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/21643255808.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/98314319304.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160adf182520d1---gojivoruvokoxerusevaxexo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16081151666a5e---91075382270.pdfIn PDF document text
    • https://baptistfriends.org/media/buziwinosijobugijem.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f5afc9c883b---mararovupiv.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f5753137b---jodesiwetimirasuvef.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/tefukavotesed.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9933234702---53636469535.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/44591f94ad72f337a14e2084a7c0ad08/gokupoban.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/71567661531.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/43503380974.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bb799e1c08663ef300c8199fcdec269d/serekegeletivujes.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608c901d3a194---jemifumisedokobiwinaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=york+yk+chiller+o%26m+manualPDF 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_off0000d212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD212 9984 bytes
SHA-256: 8fadb8c33f686a8ba000e443238c81543cd041fad22a86d7823b1ec2dbd49818
font_01_sfnt_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 16932 bytes
SHA-256: bbe66bfcb1c29c8e2220fdae0893eba95af598231ad8fb374a347a7e6af3bc7c
font_02_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1