Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa870d0d3b49587…

MALICIOUS

PDF

78.6 KB Created: 2021-07-19 18:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7af47b7087784e19d99c8a928bce1b06 SHA-1: 067b4797a84cee37abd57900256d0a7d915f43f5 SHA-256: 6aa870d0d3b49587b2acd409205c764db564f476e5746ef7d344501bd216817b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farms indicates a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcc2bc3ec5---zexelalexedeposanojisenab.pdf In PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/91426a500aca8098ee6151b6b91c4be7/29373341460.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/49555193530.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/10274e6a62e43026786e62ed32254d36/datuzikabiwon.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa5c87d32e---93727067010.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e9f0ed5e50bf786e0265383ecc4cc876/lowukumog.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/tojemamozevupuwobonirezod.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de3fd40ffad---daxedegakowivebewo.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/bijonazifupusasuxepimaj.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3633a6321d---81871607179.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/timusuxolowavoruw.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/kilufi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a38e5b604fc---vapuduwupikanozu.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210531161855.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f7ec8ac1c4d1ec2852702f62ec31bd9e/nevutopepixofuxot.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/wazudujuxalupukerusunofil.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/72747702389.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/72040381157.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b996c6b4c8763004a1462a9de5bcf19b/43954066581.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/88314094805.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/9135840926.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/pifadedefo.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9d26d5b3c25668a29fbfac2232814b55/xanasanewexumodajavat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=chapter+4+science+class+9+pdfPDF 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_off0000ce76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE76 17684 bytes
SHA-256: 6b253e58d7a1cc953eb25af3eecd9db150aa5f77019d47e124b2ae86f008bef5
font_01_sfnt_off0000fc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 10876 bytes
SHA-256: 54723dd3fab0a65de70a40dfd4549321143e23488c4563b29de772b32cbeaac3
font_02_sfnt_off00011541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1