Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cebb4cb77fda17…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 01:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e19bda20cdfbb6c53e92f3caf54d2611 SHA-1: 86bbc39bbe3c1bbda577007cff44e9a1bb2cf4c7 SHA-256: 36cebb4cb77fda1737aaf3aeed260e260727c93e9dd7f962d76a56a6fbb7e9e4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple links on compromised WordPress sites and disposable hosting reinforces this phishing and redirection pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://esportenerd.com/app/webroot/ckfinder/userfiles/files/petomabuduw.pdf In PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bed53a94e9f---kuletopipun.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d5d011269cca4c8bd24deac5bde0a527/ladezetigukabapabebodedug.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/2da83b90671ff8cf565715f3b3fb92a4/27920255720.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210818/2258373877.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/768c23bc4a529927cde77a5489196c16/36008653289.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd24656183---mukavemo.pdfIn PDF document text
    • https://12shio2.com/contents/files/38834804714.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/jeminowodisel.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/devizamivofeg.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e1713c160---fejagojil.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/53323226445.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/gosanozanigelumimidakiwe.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e9061ae47---bubulorikijufizolu.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/b1qpjq5tgvrbqi726pv0rm5ibq/lemepovaj.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/98488430823.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/21a8d044c4296f91eff9e79528ba0b8f/vifusopaneraz.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086a0159b77f---53469664284.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/31849720130.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/titebubagid.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dafda7145ec---91731740113.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/358a65dd0e59d83fccf53e7ee60ea27f/98740839346.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/26316774610.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/rarovuwoki.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/luzaridodigefozumuva.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/nizixozedepipivawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+do+you+call+a+group+of+raccoonsPDF 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_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001047e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 20564 bytes
SHA-256: 228263b60b5c3dfed8fe0e9521f26f04fc1d58a5cf1f49c85a0f2e6fdd2a8af0
font_02_sfnt_off0001388d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388D 10884 bytes
SHA-256: 9fccbb26000f4fc626b17fd2e2758a618e9ed1b114c9abe62e54965543b1acf7