Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba9ff2858352d34…

MALICIOUS

PDF

133.9 KB Created: 2021-08-14 05:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a2bfefe03a913d7ebdf82480371c816 SHA-1: 5bc864d2b514cf56207f8c8de955867190b1f55d SHA-256: cba9ff2858352d3405336e262911cd25c97a1a3aaeb37c9af0c4faff83fc1242
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to potentially harmful websites, possibly for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://accidentmatters.com/ckfinder/userfiles/files/68087948116.pdf In PDF document text
    • http://phayaotechno.com/UserFiles/File/xujenogikipifubojugezaja.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160beda83e3b0e---savodunapilat.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/45662046357.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/53732071174.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/47017384641.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a6e9e761---57157502352.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/99fbae2c4644b5cfe92ed5f6d7214bf0/73968853047.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/rewegogurivepujifeginivol.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/ruvuxemos.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/47840501025.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/60932725727.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/wideriminifav.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0337e7b6034ec019b82cc28ccdbfbf53/19428739770.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/21654656166.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160873e68b482b---2848654365.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/pidagogadaxutema.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/26889150437.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092e4e976e2a---tolala.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/vibukebolof.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7fa304237---faxiz.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160757933b3357---fonaxusazosov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=anatomy+and+physiology+terminology+prefixesPDF 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_off000191c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191C3 11144 bytes
SHA-256: 1b4e8ba0859d24ced5c7915a24040da9be1af8a6f505733850a5255887c75325
font_01_sfnt_off0001ab71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB71 32720 bytes
SHA-256: dc62f7e92d3e9a608540abff09d55e4eaf7451365362127e1372cc18a19837bb
font_02_sfnt_off0001f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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