Malicious PDF — malware analysis report

Static analysis result for SHA-256 0623474633fa68b3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 23:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91b174c4c14fbb2d7813785cc3055e58 SHA-1: 73f1c66effde84a0641f40db8bf76b77b59cd4df SHA-256: 0623474633fa68b33e6e590a95164f5028be387f6cd00d8c05b4a5bc209dbd41
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URLs, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The 'Fake CAPTCHA' heuristic indicates the document is designed to trick the user into clicking links, likely to download a second-stage payload. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://drafthe.ru/uplcv?utm_term=street+of+rage+apk PDF link annotation
    • http://519pf.com/userfiles/files/29900814357.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/zafesapumop.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/49443106806.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/kefunenudu.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53610891846.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/risarox.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/25035112844.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/95254441419.pdfIn PDF document text
    • http://okvin.org/userfiles/file/25684101564.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/4e8c91b0e2e22a59606035dadc33af68/berijidoni.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210901_163123.pdfIn PDF document text
    • http://furniture83.com/upload/files/29193051131.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/47511856909.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/dimopidi.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/95963576077.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/26726294140.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436ef39f2e5---lolaj.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/51589783424.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/dimozawetonatawuj.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/poneliwemepaladatapid.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348c7a91442---87821933965.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/66121548017.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/1339293806.pdfIn PDF document text
    • https://cet.sk/res/file/monop.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_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 18000 bytes
SHA-256: b778236144a0d8ce28226037e5176159c63da3ba6261dd0161ca4d8990ba4876
font_02_sfnt_off0001256b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 10292 bytes
SHA-256: 72d5e6e6b7b73f6128511c2a499e1dd194cbb1e88d6dae0faeea5592cf6c97f7

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