Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe77d7a39f926700…

MALICIOUS

PDF

91.5 KB Created: 2021-09-21 02:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd98da4c0d5d1793745aa55e9ac7081f SHA-1: f2d8fec7f7cc66bb6150b39836564f86fb556240 SHA-256: fe77d7a39f9267009bb0941d641ba667e5802411f28853ce7e606d7ed4fe2eb0
156 Risk Score

Malware Insights

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

The PDF sample was flagged by multiple heuristics as a link farm and a phishing trojan, with a high ML score and ClamAV detection. It contains numerous links to external websites, many of which are hosted on potentially disposable domains or compromised CMS uploads, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

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://y3stwk65l-mn9.com/contents/files/20669251240.pdf In PDF document text
    • https://tckontrola.hr/files/jixuzosop.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/792116298.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381f779b48c---mogexitidebonipabedaz.pdfIn PDF document text
    • http://synphabase.ch/upload/file/47550778349.pdfIn PDF document text
    • http://gespk.com/userfiles/file/71867369816.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210913151926.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/45798451795.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ba0b3e93---belizobidosari.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/86522493698.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/nodaletexes.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/60661579331.pdfIn PDF document text
    • https://designclarf.it/file/zejejireru.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f4e806850---11009554238.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/59619931350.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/nejuleviz.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/18092010731.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/zelekimoxizejixutam.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/jaribefobiku.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/84368930151.pdfIn PDF document text
    • http://charontrade.hu/data/file/65793490735.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/23943930118.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/ginalakikovawupekimejakof.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/lusipug.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/gizunuxejikexizirogamal.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/74215704970.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/bodotewojofagaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+bedava+oyunlarPDF 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_off0000e581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 17560 bytes
SHA-256: 433367e852bbaf5cf76bf7a21cfca6361e80604936860ab3ac6c9401b9a9a049
font_02_sfnt_off00011805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11805 10376 bytes
SHA-256: 53f3576ee3680a333cbbf79197132dd79e8011282a0a5a9174cfcb3a061fb9a8
font_03_sfnt_off00012f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8B 19116 bytes
SHA-256: 292f54891e1af9c31f545a05b58f5857de91eab762bfe5d57d1d7d34fab64e0f

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