Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0339f2a77a9332b…

MALICIOUS

PDF

85.2 KB Created: 2021-09-07 18:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac04803a698ba2c098c7c62f6805ddd6 SHA-1: 3e8312f0df8837db2dc8913087bf4fde507001e0 SHA-256: e0339f2a77a9332b7fa8136364469d026829126175ae5a9bf2bee4d3ced9c68c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection as a phishing trojan indicate a likely intent to deceive users into visiting harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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
  • 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://geredekombiservisi.com/userfiles/file/31141973033.pdf In PDF document text
    • http://anpo.vn/upload/files/denexifef.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160da064e162ed---weruna.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/kopukefiwezar.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a7b5be662f---masogijokunivab.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c25fab3072120057e34bad2729e8e88b/dawawawadunejugokixog.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab0b7bcfba---12207303715.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb39472500f---25940152436.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/maginemojubupufuzepob.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/b2pjulq38chfu8chgbdrur10m2/2384408417.pdfIn PDF document text
    • https://artbynela.com/uploads/file/vetuwibakubadixigat.pdfIn PDF document text
    • http://effektfilm.de/files/file/60405150711.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/52475496618.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8b245ddf4---47312324552.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a905a52e542---82787996751.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126dd12c0e87---38699544670.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/pibipupogugola.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/28987670641.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/razunaxisufafek.pdfIn PDF document text
    • http://riversreunion.org/clients/8699/File/5473746415.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/86127803814.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/45182043493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+separate+pdf+pages+in+adobe+reader+dcPDF 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_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 10968 bytes
SHA-256: cfe21174d2abc694834ed3a51fbb6bd5e4b5d31d8352812f523e5c30b7daad3f
font_02_sfnt_off00011923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 17560 bytes
SHA-256: 0c6ad193211eb1fb9148110423d11b393182161e21eec75ea88c7a6ce4199a12

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