Malicious PDF — malware analysis report

Static analysis result for SHA-256 4586286ddd7d2c75…

MALICIOUS

PDF

96.6 KB Created: 2021-10-05 13:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 490c9049dcdbe397e840c60c7bd412ee SHA-1: 6ea75f29e0dbebc00ca620c1fa7dda970a09e3dd SHA-256: 4586286ddd7d2c75585d4a545dc50d684d0bbfea795cd3287bc6c9e7d0c8baa5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including an ML classifier and ClamAV. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic indicates the document's content is designed to trick users into believing they are owed money or a prize, requiring them to pay fees for delivery. The numerous embedded URLs point to compromised websites and link farms, suggesting a distribution mechanism for phishing or malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://queure.ru/uplcv?utm_term=gta+how+to+earn+money+fast PDF link annotation
    • http://beccaro.it/userfiles/files/rutamafikugag.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b054a0aa56---wuwowisosokez.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/69516076765.pdfIn PDF document text
    • http://health-bridge.in/upload/file/vukujozalolab.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/24818291389.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/resox.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/26030321876.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/verobumexeseruzuropefif.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/a00e2d83b6851afbb3fa60c3da71b9f5/92493193202.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/geravaxeposebomun.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/27533885225.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/22181644a131aa96f5a40b20ba57aafb/85809529691.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/15910633984.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/37096325575.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/83457860811.pdfIn PDF document text
    • http://newo.ru/files/files/73117170940.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8l3cuu7t1l54gl7m512u7a8v0o/87630760541.pdfIn PDF document text
    • https://hssanesteban.cl/files/pagefobinaxutozofus.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/lilemanorugezalixigabu.pdfIn PDF document text
    • http://farashimirooz.com/files/7831264048.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_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 19988 bytes
SHA-256: c648fa48c98ecd5042082b6c2e4a3a1a88ba5ebbd8b239ffe1e006bf5200e368
font_01_sfnt_off000144d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF0 10580 bytes
SHA-256: b64f4a625a663ced05d305e16aad1959be69392d8d71d7417bc193214fe6b42d

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