Malicious PDF — malware analysis report

Static analysis result for SHA-256 18672a3571807502…

MALICIOUS

PDF

90.0 KB Created: 2021-09-02 09:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a8da7a1990434d8daeec34291e979b0 SHA-1: 231103606b9e61b0c7130eb435064e4190dba975 SHA-256: 18672a3571807502589f0d2a46129494f64adcfdb9484458fbfa964cfb70255d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7885

Heuristics 5

  • 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
  • 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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c74d7a021---wukiranixuz.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607472226618d---83061195092.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210703040307.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/62b908580be74bb4d6928ad300477bd4/70806891527.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/gelunepoxugudaguked.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/eu1et5l3blovkj28nclhvpqrt6/47277299481.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/08-30-00-36-03-48.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160b082b472d4d---43865310820.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/367feb8bb2893b4380c16b87a1c7f7e0/tubozepijarivuzolikaxur.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/8331243432.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/gonekotulabokirag.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b412216f80---rokenenubifinalirivefu.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/57119470283.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/paroxewol.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8b4988d4c00d146c447531e888954593/64339810485.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/zexobevovulejot.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec61f2e096---89747706418.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/r6l5q7gv7kckm7oa8mvt65h37t/xojopapefekizodagi.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/guxumifatepetiwiremux.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/83800992767.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/fekaliluwodoguvarazatozon.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/cbb956f3b8dd7b6059d29d1931bd3f76/ruked.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/c27d378e2ad44a41ddda65f4503dbd0b/marer.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c26fc7df33f000a0bcf451d946439931/55904445271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=rental+agreement+cancellation+letterPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001302e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302E 19532 bytes
SHA-256: e93816cbe0136a49e799c836aa529c0bbac24a6555a5b9766a1997ebeaf0af57

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