Malicious PDF — malware analysis report

Static analysis result for SHA-256 1070941f86b5e971…

MALICIOUS

PDF

48.3 KB Created: 2021-09-03 01:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 10abcc6cb4909ed3b0595d6f7f2f0f9a SHA-1: 4c66781c487dfc525e40479b0b95a1aa31c1bbbd SHA-256: 1070941f86b5e971ae4ab3ee242da489658fe3165e3f61f960a87ba9a5f895ba
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The heuristic 'PDF_IMAGE_LURE' indicates it's likely an image-based document with a hidden clickable action, typical of phishing lures. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely serving as a downloader or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6834

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 48 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://chcial.ru/uplcv?utm_term=printable+worksheets+13+original+colonies PDF link annotation
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/014b73a5e229ef067ab2c4f04397180a/wiwoguku.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/vimodeliv.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcbf9a9b71---givinifi.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/68284197341.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdb19c8acb---jewobosogiw.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/dixatobegavuxisuwejup.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/porajapupinuvajiwejela.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/3f36df2c98cb05adcf58264a72132fbe/6822601338.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/potefagedakuvozofu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e4527f8b297---xodovejixesekidutuxoj.pdfIn PDF document text
    • http://ubest.ru/images/file/xutiv.pdfIn PDF document text
    • https://gangnampools.com/contents//files/93731979447.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8f93399b1a6fd45fd1dd8a9a9c2cd3eb/27486533711.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/kogitokol.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160912fc30ed92---74024150537.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/82690218271.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121ce860872a---58702187719.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/16199573827.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/98369546505.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/50927371901.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160901d701237c---32062052320.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202108101941014138.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/pugaziviwolog.pdfIn PDF document text

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