Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e92453ba9e6f5c8…

MALICIOUS

PDF

102.3 KB Created: 2021-09-02 09:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a5f64980bac5bdc27dfe5b962477179f SHA-1: 85c93de1d790ea1a930720eb8a06938e2a1322ff SHA-256: 2e92453ba9e6f5c84cca7d863be0c59524eb789ab9bef5d9d0f289a084b9fa42
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised CMS platforms. This pattern is commonly used for phishing or to redirect users to sites that host malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://garglob.ru/uplcv?utm_term=peace+be+still+meaning+in+the+bible PDF link annotation
    • http://traiteur-ribot.fr/userfiles/file/13166792754.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5770c1167d---xepik.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/49170851657.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/47194001865.pdfIn PDF document text
    • http://katachizu.com/img/news/files/98790992336.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/5cb5dadbc8705cf2be2d446704d22aa8/luwoja.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/fenepajivitarupu.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/befavisurobuwekomadeviro.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/19489334449.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d2eff4d65fbeb481e51a138a6ca6ee83/66973427453.pdfIn PDF document text
    • http://asqcert.net/files/files/waligezenefaz.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/kefabe.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/bubpdjp9v4brrgeqd7l9a0ppno/56801348413.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/964c3ebeecfd8d315d8b243729761cb7/vupuwagewedesasivalejo.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/mibaborol.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/zipilatekunudefikogegiw.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/78138537605.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b1ff49ccff4b2d5bb5e01d3a232581ef/pebub.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/474d9d7c439d9ff9d0368b4853afea5b/37684425306.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610627adb94d2---77983091867.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088079f1c734---dubetoko.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/23956195486.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/41847332852.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a722798385---29104345892.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/62059752076.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_off0001286f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286F 10596 bytes
SHA-256: b0c1783e363ab8666e0a712ca77d162234f713f8f2a79d62001f8fe91ab84544
font_01_sfnt_off00014069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14069 19268 bytes
SHA-256: 76044dcb8acb0e1c2268fb2cb9b1ac35418dd775f5928905146d0a5d19486c9e
font_02_sfnt_off000171c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1