Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f9dd81d32ee998…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 17:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a3e4f0fcdc7e9e806240618e2a821c8 SHA-1: 5a29526411dc7d31593107c76d0d43d315394464 SHA-256: 02f9dd81d32ee998a0c38b83c657f8f8cac96d70c40ac2e3f554b0a7585cb2ea
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect the user to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=money+word+problems+worksheets+grade+4 PDF link annotation
    • https://beautydent.hu/editor_up/68593449440.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/31846428472.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/buvavuvomebobibekoxij.pdfIn PDF document text
    • http://kaies.net/upfiles/2109072317146850013egb02.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///83200322107.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/cfabf8af2936b63d913664df6c38d5b3/nezisefesawuwuxujipojugaj.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef64acf51---zelofidilibalaja.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/54351918727.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138abba6b478---67144426877.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wunujewe.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613667810be1d---16659428694.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/88149912519.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/1qn2r9do8hm605a40412t2c0oq/70544915860.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/fademufutovifenisanetef.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/55598441017.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/1943477106.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210901_A3B192FC19295741.pdfIn PDF document text
    • http://c-amc.com/upload/files/donelonopisuzixomawa.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/saripodowupononezanulix.pdfIn PDF document text
    • https://austarpharma.com/upload/files/82517575230.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/nidonilafujagopez.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/33194471166.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/vuvelen.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_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 17384 bytes
SHA-256: b5f25f61ef2fc497e5dde3230e772a1ad39a3fa5af3519a72d489cc628b0ec5a
font_01_sfnt_off00010b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001234d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234D 11248 bytes
SHA-256: 9c5b5e8b42fbdb923df693ae9bbeac24970c9e71358fb826279de3eafeaf643b

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