Malicious PDF — malware analysis report

Static analysis result for SHA-256 974cdb0a9c81a8b4…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 13:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a30880af78ef401c030be79b86a48bba SHA-1: a71130c3ee702d7788141ab5d25db23af0f028ce SHA-256: 974cdb0a9c81a8b4603d5b605661d923dbd8f70ac5a1a75b0b233c7320990ae7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate 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 https://danfort.lv/userfiles/file/77379611510.pdf In PDF document text
    • http://chinajnbt.com/images/upload/File/mawapimijozem.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/famikotusiguwukapenifuvi.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72982221285.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/802437a7d908b750073d06d41e94f702/gubudafowesizevi.pdfIn PDF document text
    • http://guitarenko.fr/img/files/watise.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/fogiwapimuximasalimovem.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/16798088813.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/vutapetuju.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/wozune.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/vawimuwutekemo.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/zojatanofit.pdfIn PDF document text
    • http://thebottombillion.com/business_school/uploads/file/nitojiluvukejewagonena.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/lorifavuvoxemusidibetowu.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109101923083826.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/vuxowifet.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd6e3a00fb---sulasibefijugiloxeza.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/95e0ad9798dff83c0e25987caa8e8f2e/17486987029.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/wekavuwuki.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/44798968230.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359c67ddaa0---78064372389.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/5596588857.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/88004937871.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/78906617593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ml+adventure+hack+2020PDF 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_off0000b0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A2 10580 bytes
SHA-256: ee19a6961bf26f75d08a08c12bb0f5f11156bc8edfc06e0fce1dfa6c0f1507cd
font_01_sfnt_off0000c8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 15480 bytes
SHA-256: 3083586014ff38dbeb336e8740c690f5e5daabe118ea47b35aa579a124cda0f7

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