Malicious PDF — malware analysis report

Static analysis result for SHA-256 605e64c521cefd02…

MALICIOUS

PDF

80.0 KB Created: 2021-08-18 02:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 481da4716da9f62752e0fdb8ef13e5ad SHA-1: b7affa4b8bff9a55c786e7e01830b881130f2ffb SHA-256: 605e64c521cefd02831ffe03cc0225c660ac92f844cdb2f425d25e00565f1670
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to external websites. Several of these URLs are hosted on compromised WordPress sites, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/pewexenexelowevitusajufo.pdf In PDF document text
    • http://sacoorhealth.pt/site/upload/file/moxujavogaxepavebabevik.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db95c997d9e---37214144682.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/movesiduzigurini.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8eb11586---vawewowamuzalumelipa.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/foxaxakipetifoz.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/jizutikukabilap.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3d605ed71---lilizugiwanutomawejemeluv.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/9623048937.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/fb5825dd62a149be02fb0015f307f5e0/33014529904.pdfIn PDF document text
    • https://campermagazine.tv/public/file/fiwonebenonoxaxomasopaf.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-13/20210613225806233208.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/7ckl8bm2tivkurt5o1f33hdvo2/25729713888.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/vibegododubege.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c47d9e957---14730877535.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/82151771267.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/89795881546.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c3518d0b0---47780984421.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56552062421.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a36c11ff2fe3bf4467c6e48176e1689f/kebuduzalakiji.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/nebezumalexojaturopulas.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/81132911536.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/35727293710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=escalas+graficas+de+calificaci%C3%B3n+evaluacion+de+desempe%C3%B1oPDF 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_off0000d29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29F 16644 bytes
SHA-256: 46f2083e9c66bebd4a8318d9442f6930754e7391ee3c06bef86356e2fb2a605d
font_01_sfnt_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 11356 bytes
SHA-256: 2c5608c713fe104ff23cb34ac57f95c0619f209378bd89e8d97994eec96d2d9b
font_02_sfnt_off00011695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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