Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1237f2ce305416…

MALICIOUS

PDF

70.6 KB Created: 2021-09-06 09:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 432c7906a1c83ca836ad1954749b4d93 SHA-1: e5e4ff16654ccc5832b563bd434d992c2927f2ce SHA-256: 7a1237f2ce3054164a34b7168010ad32602296e0a1f5c76ce0adcb5cd3654b46
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The presence of a link farm and the use of 'utm_term' parameters further support a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=instructional+design+principles+pdf PDF link annotation
    • http://cathugo.de/res/wysiwyg/file/daniwunetebi.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105151024174392.pdfIn PDF document text
    • http://vanhacollection.com/images/files/80813251684.pdfIn PDF document text
    • http://fittbikese.hu/files/file/werodutojofutaratane.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/zodot.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/xotebozesetorogif.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/vekiladumawejij.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bf92e3a402d---dewugemidisovolebun.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ba4367305---59271651863.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/29615075041.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/pafule.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/noxatixesivatewobute.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16282218153021.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b518546ea---36216945446.pdfIn PDF document text
    • https://agenziadiviaggiocagliari.it/file/70060116563.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d327948eac---35948558495.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/8259768068.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/sikelisiguzisituliripute.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/1934823686.pdfIn PDF document text
    • http://bdn10.cz/files/file/98037094543.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/ca63b4f6fae07156a3d2f78b87589ef8/tokonopijadimodopu.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/lolesagitinarinaz.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e5b605789---vilukoriwigokepitadino.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/rutituzam.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59C 16424 bytes
SHA-256: 2fe45364aadcb994c9b522445c11f0d778f7e0622e1d855140ce652c20b1d93e
font_01_sfnt_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1