Malicious PDF — malware analysis report

Static analysis result for SHA-256 93112c763ab94037…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 19:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 292ff025138d3213223f5d1092af3b92 SHA-1: 5834f6233d12a34ffafaa4f3f6c296dddd0150b1 SHA-256: 93112c763ab9403765c7b64740c78d2a0222b5b63d3f1da45dd088df30716755
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs pointing to potentially compromised websites, indicating an attempt to deliver a payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.l-games.jp/js/ckfinder/userfiles/files/26917720873.pdf In PDF document text
    • http://hongdacable.com/d/files/jipuruxosujabazegiwu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145067b0a5d7---68166888458.pdfIn PDF document text
    • https://socardan.com/userfiles/files/wobidepikujebuxawawemi.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/1jrhcbpr8hdo9u5gpg2inq2e9c/5688200383.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/42347950608.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/lapoku.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/69337660666.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/13341834720.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/kutumakezivobeloduzefuj.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/xonij.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/fitobelubukamulil.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/zemitugafatas.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/20729119170.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/38784555879.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/mipopenonibuv.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/55507763589.pdfIn PDF document text
    • https://curvy.tw/upload/files/14253565763.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/vebijos.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0abef3455980d7dcdfff8ac25d70536f/42698004981.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/wizoximu.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/nexuwejopeponozapigi.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/suviledepolirowojipe.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/dikumuloxinasejelidoxewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cara+membuat+file+zip+di+androidPDF 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_off0000d68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 10824 bytes
SHA-256: ef433d27e108db9748411582b8da6dada448a97494d7ebde856d0adb1b8ebc24
font_01_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 17336 bytes
SHA-256: b9efbc097824a72423a61565ce9e1e2a1324f483df887c9b86bd36b4b8d46dc1
font_02_sfnt_off00011ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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