Malicious PDF — malware analysis report

Static analysis result for SHA-256 83aadc44d1d714c8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 22:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95f6226ed1f3a3675f8a8312e9788a1e SHA-1: d57d7d3e20ff19147e389a2aa3a022aede4c7f94 SHA-256: 83aadc44d1d714c8940828e87fefe874f20757a5930edc84c09698bc8f3033e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://quartierdete.fr/uploads/fckeditor/file/zatemakaperurutomixeriz.pdf In PDF document text
    • http://hwayoung.kr/upfile/files/76342181839.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/malajusuteb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614229651d2f9---soxeguruvab.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/zizumekiwumiled.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/95447697572.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe0a1f6d6---defaxozeza.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/masemus.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/32882034567.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/4643843333.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/suninosibebiveb.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/gitufadijimofupeluzumo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/21707566109.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/73323850500.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/gotoke.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a4103746---22794461715.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/5842565398.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/wemofotu.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/wopiwo.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/bibumatanuda.pdfIn PDF document text
    • http://aminotp.com/upload/files/52397148217.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/12075272346.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109101804082323.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/biroj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ludo+king+unlimited+money+apk+downloadPDF 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_off0000cba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 17716 bytes
SHA-256: afaeb918b0abedc22f5de0fca78652386e60c56ed6ec24cf6ca220094dba86a9
font_02_sfnt_off00011165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 10816 bytes
SHA-256: 7fdfcfd61f47bcc53b726bb44b21dc5f21aa7180aa0e7185a72998b1cfc039d0

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