Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98826f439f8eaa7…

MALICIOUS

PDF

74.7 KB Created: 2021-09-15 23:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb0946d93c8975b86a5ec363c4d2f5c4 SHA-1: 19ce50180a11d5e3b4e077e230e32b438bd689b5 SHA-256: d98826f439f8eaa7d1d18ef19e0ffeb8c9a20dc1fc73c0c1d6cf57fde97e1108
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • 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://mayjack.com/upload/files/95521916355.pdf In PDF document text
    • http://ats-dz.com/userfiles/file/kepogeketot.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/25016651791.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/rekedopaletenologekoxebo.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a9d6fd06ab119dc459f2aa25fcc153fb/40513309893.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/50850624079.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/4411441098.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4b45f107ea1af55750787f351bbd12ab/matigakusekamiwuj.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/98332370863.pdfIn PDF document text
    • http://humanlitech.com/files/files/wovilazulolovimugetom.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/tunilizofowos.pdfIn PDF document text
    • http://tavio.su/files/file/petak.pdfIn PDF document text
    • https://sim2007.com/files/88889560613.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137abe5eff69---fabetunuwibezavoje.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff14c117d---zutopesole.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/marev.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/pomurakoneluvas.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/63013995305.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/94592601443.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/28448695735.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/92135878543.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/gejeru.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/fewopotibaf.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/47293735424.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/26414332638.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/desenugikufabemizidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=code+to+hide+number+on+androidPDF 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_off0000c233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC233 10568 bytes
SHA-256: 07498591bd8fecb6de610310df288f673808ff19a1a75e60c6ceedd8dc3394a8
font_01_sfnt_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 16680 bytes
SHA-256: 51b14a45a485b057f702cbb5b88f95bf6ec2151c1dd02cb36176a7f81d8abad9
font_02_sfnt_off0001050a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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