Malicious PDF — malware analysis report

Static analysis result for SHA-256 18baa59791f69d87…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 21:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 88a99e93474fa3e71f8e3fd62589230a SHA-1: 95a2f8fba153fddd5dd49c51c43df04441b8b1bc SHA-256: 18baa59791f69d87203b2ba74175e1ee400e39e0bd68a1b78f194ef9c1578e4d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to phishing or malware sites. The presence of external URIs and link farm heuristics strongly indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://inwebjor.ru/uplcv?utm_term=labour+law+ebook+pdf PDF link annotation
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611095fc94342---82561615332.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/jugexumemunabo.pdfIn PDF document text
    • https://cet.sk/res/file/jexizegunasakulepo.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a73e90d05---xaveruliza.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210606030024.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/rozizimedizanegeradopegi.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/falijisede.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/11686745840.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8a117e123---46855090169.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/55sv59vph8jimh3lih5m7jb9go/52655419661.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/29a3db704a9d82ace499ab8a1f00fa6f/siwojupibugiguzafibir.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16126e5930341b---dunolupamilisizipas.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/75059334626.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ba505b2d---nipojaxudabago.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5dacc4cad4d44c7ea21fcc0966db1fb1/nutuxekupevatexirur.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/342459f006a72422218263f843e64476/1062445654.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/wazijanawewuwutululemuvor.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/foxaguxuzaron.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/siwavanijegazasobujejeliv.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/vurepuw.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/49104867861.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///dujosizaguj.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/kabuvot.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/17477582562.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfdb2cd1db---47332455236.pdfIn PDF document text
    • 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_off0000b840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 10404 bytes
SHA-256: 183173f0b01dfc323fe71111f9ba1a1cba21a8c92cfa4af41da8fa0a716ad5d7
font_02_sfnt_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 16356 bytes
SHA-256: 99622ade9cb93e3894ab30dab06388123b1dddf7c6abb58e31d2a066c7a39d28

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