Malicious PDF — malware analysis report

Static analysis result for SHA-256 7625c9ed221f195b…

MALICIOUS

PDF

90.8 KB Created: 2021-09-01 15:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ac3b268d4e2f220f6773840054a1170 SHA-1: 31452b1a63ba9e2dfc3e3f0c45577c2c9fbfd886 SHA-256: 7625c9ed221f195b182ebe40a7f6a4cfb736ce4a0bde00b6f9c10527bc79b8e3
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The primary attack pattern involves luring users to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7f417e69a2d9358c9cc4269baf9c0b97/lavalofaseda.pdf In PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/15177066274.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c00bb267ae---jifamumegukebov.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/749sijkrvnci2a5vh69ifdfs5l/vapukamidi.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f0549ee5008---vitedetumu.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/wonex.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/26034226420.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/71990446564.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a5ec0c83c7---25457389643.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/lojegetinivafivadi.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/wajojelal.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16119a67271a7e---diwinapefafelaxo.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b8f1f8321a7930ef3e7713e73b5db4c2/32554700786.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f11c53353b---kixefuvurojovuvineja.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/xopubenakomikutebo.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/nudexowojivuwiguteketujo.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b6401117d---pofepokejexolobovimeziju.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/gilonuvubodude.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/47371386155.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/netikimagamabosijoxoma.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/97685321697.pdfIn PDF document text
    • http://falerisztika.hu/tmp/5974793687.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/furiwozuxilewefuxodenupel.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/wusuz.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/jisoninepukuzexut.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/41271521177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=compounded+annual+gainPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 10500 bytes
SHA-256: fc2f83376019786c1306ffc33a472bac16da6a9e8f584d24f4cea79ceea847af
font_02_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 16192 bytes
SHA-256: 126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd
font_03_sfnt_off0001191e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191E 26612 bytes
SHA-256: 0b28b6740ff8790e667310198008b915a0fe2c094af4290668bf02fe3f9dd1f8

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