Malicious PDF — malware analysis report

Static analysis result for SHA-256 2091756d14396809…

MALICIOUS

PDF

78.1 KB Created: 2021-07-23 03:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 284e69363fa10579ac0105ee503f256d SHA-1: 3a8a7cc12589ba31baa1cbebff9b34dc508a8b22 SHA-256: 2091756d14396809ce681d0315bd454831cc33ae62a98c8d7531afce03497322
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple compromised WordPress sites, likely to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document's structure and numerous outbound links suggest it is designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c897ccea3---roxuwasokujulitawuw.pdf In PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac4355a171---87427182524.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/35270111670.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/navodizosi.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/49110278056.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608223855f640---mimarevozoj.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/46864490141.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/fa81c5193eddb73b12589357ebd72203/xaves.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/xulugozog.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1622506552.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/74f77ca1be333d163b6203d15d2c8b83/zafixavafobamigixor.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/40775306161.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/72388226833.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/46526166663.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/42721348456.pdfIn PDF document text
    • https://subarini.ro/mm/file/16061944750.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/94252095844.pdfIn PDF document text
    • http://asvpp.fr/pdf/37489300861.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6e0673654ace3ed6342cbb48c20452a6/41856643071.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/70502491050.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/vegezaratiwotasedesij.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc4b1cdd7---lidub.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f9282de4aa2ba592e235a87b44fa1892/21928334677.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bd1e595fd---jikixolimubeben.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/sekisonebotodijebup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=longman+preparation+course+for+the+toefl+test+3rd+edition+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_off0000c6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FD 11296 bytes
SHA-256: 219873aa9d31302cd9312db7ac74077e2458d3c21aa0e2453f47b6d55ba6fbc4
font_01_sfnt_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 17916 bytes
SHA-256: b329428bbd5ffe889ae25c04de146d61555e54ef61833a96278360767d34bc28