Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdc00e1d585bee7…

MALICIOUS

PDF

72.9 KB Created: 2021-06-30 21:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d9181aceabd2a91b934bb7a1f58c14b9 SHA-1: 4dfe0204c0b27be5e83576572dbf1b0af8573b6a SHA-256: cfdc00e1d585bee77643439267a9efb5130228fc4d86f1781f0f1586f9155572
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6218bbf3---najirisura.pdf In PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/9833601086.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/tozewafigizunagukumiropa.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097c9af0be7d---saredivis.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/jajenawabolisiwawojaroriz.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160afc81b333c9---kifedasetikofu.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/88b1bdb13fcd1a1165c0676762202f74/38902339503.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c774dbfa93---ramojejuwukax.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/sagusowed.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/b66e7ea616679211088e4baa76f44110/nanumewokivuzotadis.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/38947023149.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/893166fa3265578b8bd1aab7c2c706f6/29989081752.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/39501082373.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/polodazij.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/62f2d33473603603d709ff892509d692/97209964949.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/20489603126.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/24113744095.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/8106637599.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/d16209d4a3a7f6445154cbfaf41e37bd/58098676594.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb525df99c---gopugosunu.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/c0f7crsu787h63c120bo1svk8s/95377713548.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/73133070025.pdfIn PDF document text
    • https://hsse.cl/files/6752704649.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcbbee64e3---libofojivitokebatifojebek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+book+of+birthdays+russell+grant+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_off0000bb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB89 16276 bytes
SHA-256: 157f2a58ad4b66032812e7f9dfdbcea6b7d1f15d938b20f58ca98198cb4fe99d
font_01_sfnt_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 11184 bytes
SHA-256: ea801ac425026d0392036f19ac4242c2e93403e7ab82458cb0df36f8234f4e99