Malicious PDF — malware analysis report

Static analysis result for SHA-256 72785d3773e6d1a7…

MALICIOUS

PDF

74.7 KB Created: 2021-09-07 14:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 53d4c6f0d3c783c08b18f2fb796e622d SHA-1: 4f769aed8cc2a1f5a28d54e4d28ee32f43c46899 SHA-256: 72785d3773e6d1a7a57fb3f2a84e538109fc59f0fd526f673f10ffadd6511031
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm, with many distinct hosts and URLs pointing to potentially compromised upload storage. The ML classifier and ClamAV also identified it as malicious. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://lesmashclub.com/imgUpload/files/kufobimabuputotafewosulex.pdf In PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/eju84n0j022s5f75erp90oqbqm/30037464038.pdfIn PDF document text
    • http://hrudolf.com/userfiles/rurabokogenodeve.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/qvsav3nol5d6oq0qgl4akla3g4/39085915447.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/75c5de7ee57a3b40a9493932e59c0a42/2920738316.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/42118468815.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/1409241146.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/vavuladoxaruw.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/86297763812.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ni2khfgv7tp33m9it1lnegcs8a/mazot.pdfIn PDF document text
    • https://primer-spb.ru/files/files/25907609450.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210821_204334.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d7c327887---96455684822.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/26909774632.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a48d72f35be---59569237022.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/buzedas.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/70366623288.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/jrcgddbh0mdffe2vvdnr3hjot4/1874200724.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3f11659e---wapemipalubapope.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1611302bae282f---vifuruwagotisapoxat.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1c19430f4d7f333d2ed00f7b1fd15226/gogosoredetezitek.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/ab8e22b0a955b39ba545f675806397c2/8277564908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=polarimeter+instrumentation+pdfPDF 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_off0000bd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57E 10760 bytes
SHA-256: ca60b62612e254b6bd0039db8aa4a569c9477f835abe10c229e3dce2159a8749
font_02_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 18104 bytes
SHA-256: e5a98aa12bd9677e306aa0e80a0be1ccf2a380f69553f0c54ed6a15f9d917289

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