Malicious PDF — malware analysis report

Static analysis result for SHA-256 f072ab76f7237236…

MALICIOUS

PDF

39.0 KB Created: 2021-09-05 18:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 40d24a7d86cf5788cdf4149a8552a502 SHA-1: e97b49258faab9dfdbc487012d6ca2a12f0f8234 SHA-256: f072ab76f7237236e80fc5ee4f1b605be3b59bb80fecc5133dee22856e9f5539
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8588

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 38 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crewmak.ru/uplcv?utm_term=comptia+a%2B+1001+and+1002+book+pdf PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/88341339e33218fe4843b7c54fd12abc/55145691505.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/82204002911.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/pibagunuzumebupuzenaw.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/37201e493ee4e6eac36a41384f3b6394/65468180378.pdfIn PDF document text
    • http://epmachine.ru/d/files/tezigusu.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19dc8d9641---puguresazasewilok.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/22545606066.pdfIn PDF document text
    • http://willbramephotography.com/44396836056.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bf158f0c0f536b2353039d573acf09c7/43132820089.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/voderilizef.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/feb6ae6ba912ca801ebb88f68295d0c5/xirorexisu.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/kebexaruvowozefuka.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161000d13e1e21---62581534763.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/mq3bplmgnlbqjktord2ji51ko3/kisuja.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe997c9524---logosavupozirajodidunol.pdfIn PDF document text

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