Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f04889bc21c96bc…

MALICIOUS

PDF

100.2 KB Created: 2021-07-19 15:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: e59f53337a33d3666ab765dc8e39a661 SHA-1: cc5819857c1fd860fb197692f184f596b74ed368 SHA-256: 3f04889bc21c96bcfdef46eee18d71f66939626ee47d81b5855b9e641f4c1c33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9323

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://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/cf8fe14d780d181081fcc464b7943aa6/35426028253.pdf In PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c85e7fc3c---vatifopi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700ec370735---92223923911.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/44836676097.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/21324647273.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/21876084706.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/84591243937.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/60906292754.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/b3h5e7cfrcvj1m3emh08j20iri/67297529813.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/bd2c19083e952432caeac1e5c9b0e2c9/wisezipoxugunadawojaf.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/75367254115.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/40367773722.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2139176f5---58384727839.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/72311316747.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/89813124303.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/jijuzavibilatepeb.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/buwavasiravezegovir.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/juzirevuwe.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/nozakazaxosixenodane.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/0bad1187ec0950d0bae757e29163d230/44398435930.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/72166759606.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f93ccf1c0f---84638358849.pdfIn PDF document text
    • http://ktcz.eu/files/files/41721903231.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd47de5440---30322591808.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2f45a9238---56971630123.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/50395585009.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/297e97ccc701ba67e0903bcb6c238c8a/nebagafefijotovubivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+does+too+bad+so+sad+meanPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 2092 bytes
SHA-256: 4e726621618450a1a8e6e95146ab7445e71366e16ea1aaf62970fdc8c5189e04
font_01_sfnt_off00010791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10791 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f
font_02_sfnt_off00011d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001358a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358A 19964 bytes
SHA-256: bf51dbf3803e878ef2114c3b1e447b030c4d76e81ae087b251351b91fde1f18a
font_04_sfnt_off00016984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16984 10408 bytes
SHA-256: d9d2efb5c0d8653e4baa763e2d73f9ae0191c73e74b268284a89291496ac5808

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