Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a98f12e80335f72…

MALICIOUS

PDF

52.6 KB Created: 2021-09-26 11:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c16b1f4c71790afe963301182cd118bf SHA-1: 378af0cb5862a7f1f8dfd5db844661129d26d343 SHA-256: 4a98f12e80335f72852df061bb7cf5bdd453b85b6e60c461c3528d49b23b3ef8
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8793

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://coretry.ru/uplcv?utm_term=usb+debugging+not+working+android PDF link annotation
    • https://pannonfinanz.eu/editor_up/75995496532.pdfIn PDF document text
    • http://elitvorota.ru/f/file/25988450659.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/jevemiwetokenano.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210920114753.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/35934311333.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/29782090790.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/58510015407.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142854a20204---31345203623.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/wewugeterejopegakudixaji.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/goferuwibimurijogi.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/kulewakabosebejajakerizex.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/81427177903.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/81565584465.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/janagojudinojesusujasezor.pdfIn PDF document text
    • http://chemicalengineers.ie/images/fewokenufulefazivuz.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed2fd66e42---16093605017.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/rukozabuzoximujewiraligo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161318a7f49ad7---36231067301.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/4707509580.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/wosomibujeno.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/10212338626.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/86675039325.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bf69296bf---86414367417.pdfIn PDF document text

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