Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4efefe9263fc04…

MALICIOUS

PDF

124.9 KB Created: 2021-08-03 02:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12a51176d865b712d53962bf381f7681 SHA-1: 69930112ea49351064da664714bd6234fa7ce0cf SHA-256: ac4efefe9263fc0462e5e35ffbcecbe3a54c35aaa8eea74f423b9eb26604f8f1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing or malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links. No scripts were extracted from this sample, but the overall structure and heuristics point to a malicious intent to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8987

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 http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/73a1168e301e069fd03990414c707a79/mozuxotoxasikomijiru.pdf In PDF document text
    • https://t2sc.me/userfiles/givafilodusi.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/98437854525.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9e352b888150bffebd86490e2619a87a/falav.pdfIn PDF document text
    • http://24cvety.ru/upload/files/56399808928.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/faboj.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb03d53de35---51386100618.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f732abc441cef6ad4aab5fa2821c8a9b/xaxawebobinana.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/jitapatimogeburez.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c663dac6299---77415335158.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cb71db604---vinamunuk.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/91194739476.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vebamoliwebaxasexale.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/gijorofobigumupowukolote.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cabc20404755ec10abff1ca338d3658f/ludotezir.pdfIn PDF document text
    • https://digireg.li/upload/lalazedodaratezukatewiwum.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/famener.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/bowifirif.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f47220939b---25439917964.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075aed898fd1---41726540116.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe2ce44852---kisunivasuwevutiwiwapuwix.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607fc50d34d9b---72234570573.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/4f91jcip40l8pb9h0da62makdr/vazitasewanev.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/gamin.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160988300db1f6---14756865229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=actividades+de+primer+grado+de+secundaria+matematicasPDF link annotation

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