Malicious PDF — malware analysis report

Static analysis result for SHA-256 3740efb13d563052…

MALICIOUS

PDF

86.9 KB Created: 2021-09-18 03:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24fe786c2e5ec324892dcb8fed0cd475 SHA-1: 460e28558667e476e48a948f6895e530a4000733 SHA-256: 3740efb13d5630527a937e0e016233b5992c75c1792483e49247d5ca655dee75
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. The 'SE_MFA_LURE' heuristic strongly suggests the document is designed to harvest credentials or MFA approvals. Numerous external URLs are present, many hosted on compromised or disposable domains, likely serving as landing pages for phishing or further payload delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://drafthe.ru/uplcv?utm_term=yubikey+android+nfc PDF link annotation
    • https://alev.az/userfiles/file/wawokefemezenunuj.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/dulurazenovawozabasapodaf.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/13860944414.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/58419049496.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/puvagewupukesezelaworonu.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/falegebotika.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/31378218294.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/lofela.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/dokegelu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161354c7520b25---59184178852.pdfIn PDF document text
    • https://j26clean.com/upload/files/93122219430.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/wugavezegarisonupaxo.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/93694991020.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18e8616f3---bonisemuwu.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210911_D3329A3A192DEC0B.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://iuoooo.com/filespath/files/20210913182204.pdfIn PDF document text
    • http://splogservice.ru/content/files/sumaxetajewonagasatatof.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/25021538868.pdfIn PDF document text
    • http://baoveantam.info/upload/files/29172383144.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/81567635622.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161335b8f7a2c5---boridetanevuwugi.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/xepipuraretarejomap.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/makuxo.pdfIn PDF document text
    • https://aspirans.com/files/file/9420061056.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/75070539941.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_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 10588 bytes
SHA-256: df773a55a7a117a2d49632a21d33de0cbbf2ea887ac82fc7fa2a7b66397a8682
font_01_sfnt_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB3 18584 bytes
SHA-256: 0f2c03110408687294a3a1c4399c4f65e05813e7c0191e3a43c4b1b86fbd778e

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