Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a1c81fbabf234f…

MALICIOUS

PDF

91.7 KB Created: 2021-09-05 21:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27d7b06c7fd59bbab4e4ee6700c96f3b SHA-1: d03bcf0791da32b5569c1d5e933b03bc479bc7f4 SHA-256: 33a1c81fbabf234f483c8bae43498c1b4c43ca5e75546c63dc0ff2265cfa74f8
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 compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple suspicious URLs suggests a redirection or download attempt.

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://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ksqnp88us0j2uvpg0crcdu2ks9/51615185700.pdf In PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/50355228660.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/75245450023.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773cb112f5c---63658766733.pdfIn PDF document text
    • http://wjcopy.com/upload/files/64740585516.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aee01c20584---24319356921.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/tipubiburotudisimepape.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/jafakapovemukoxemukuj.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/zagagutaxedalozusub.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcdd9a89f9---28428250892.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ea5479713835e0dd94a81f4e4352d57f/92140881803.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161216ed1aff5a---29563571281.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c55f24640---kovuxatalipexevol.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160f382797ea91---rojediwovuzuxurewoka.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/96422928081.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/fijowigepegujekirisojeman.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/31246382322.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/mogekafadefunuvit.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/94162769480.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/figirig.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/80855970715.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0d611433bf1a27c4d6093f322faeb953/mifozokupimamini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=inland+uno+r3+starter+kit+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_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 19432 bytes
SHA-256: 047f190f36fe7930e2a4d7d7e31ba7dbca013ccd107326ca6baf3c6f34d1a27f
font_01_sfnt_off000130fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14912 10724 bytes
SHA-256: 2fa7e18b75ba0cc9ea7fe102d412240d3ea6cf0e1fb0d57f015e8f201c42f952

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