Malicious PDF — malware analysis report

Static analysis result for SHA-256 feadb3be0824b356…

MALICIOUS

PDF

77.7 KB Created: 2021-09-13 19:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a97b0c3f03fcec2cea14427b3242b175 SHA-1: cb30819627d92e353894f8e62c727a8a04064721 SHA-256: feadb3be0824b356d89d60beb10234b39c451beb6c80319cf5080eda0c8ba586
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f55bd73db1---zubofofumotenibemas.pdf In PDF document text
    • https://vendax.ro/files/file/97161237846.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/ruzawabixelavijuze.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/dapejizugoxivetepizenibob.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/sijibumeviweb.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/zosufotupipaf.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dee1b1bd24---fuwusub.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebabe21c41---tugiguzugufuxurufa.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/niteda.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/37345515154.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/83398150817.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/59774231324.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/70573460898.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b7db96b279014f47c48ee9f4164657c2/12488336631.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/18031461048.pdfIn PDF document text
    • http://calisnt.com/uploads/files/ketapamazigafesuni.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/62033086053.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/99965648076.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/risazub.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/37806658496.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/naponanuk.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/bisudelukulupevit.pdfIn PDF document text
    • https://armenia4d.com/contents/files/zozuwulenokogofebolaparo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=geometry+dash+darkness+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC565 10764 bytes
SHA-256: 88189c86faee95b5c29ff7b10a69753c59f21b4d39e958301a1265f1a81a0b39
font_01_sfnt_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 19292 bytes
SHA-256: 4648b6b267c21d19539d99564eb7fbaa0b7b5f346d18728274e9d083fe9be9b4
font_02_sfnt_off000110cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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