Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7dab7c84b1762b…

MALICIOUS

PDF

75.9 KB Created: 2021-09-21 01:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8d7655bcb289672966411566c34cfa2a SHA-1: 789c255443db5829b335f217e9854c89009e0108 SHA-256: 5b7dab7c84b1762ba3ac76e2cb1f6c05943f69a139217e6fdc21e1b3440c48d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm strategy. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and compromised CMS upload links suggests the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=f1+vm+apk+root PDF link annotation
    • https://istruttorecinofilo.it/userfiles/file/zovijigexesotivanuze.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/romidukesaruve.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3594e942---riparaxivabawerekev.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/67563084092.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/66843547697.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/zekupogeniwesefosirujax.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/57475258013.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/48b399cc0c06d135f35c6c079ae076e0/73961205563.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/54123816204.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/bikovopemabumivax.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/10837225000.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/wuzetudonu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/538e65ed64470b55ef738842847a2a0a/3561664781.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144340938079---mubokubemoferej.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/voxilogukutadetokaropiwus.pdfIn PDF document text
    • http://atrsara.ir/resource/files/27047726532.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/kepifivu.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/99948274054.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/98960746115.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/72996902902.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/21586641523.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/gezujoxel.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/49433516940.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/40511595448.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/novugeravun.pdfIn PDF document text
    • 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_off0000c742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC742 17284 bytes
SHA-256: 5a4c9110268f29d85a0e73a461aed0db7e419231025fb3c11e1ce38b645deb10
font_01_sfnt_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 10060 bytes
SHA-256: b214d1761937696bf05cfb5ff0890eb7bf92c3ed9306fe20c7965fa376bbc25e
font_02_sfnt_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1