Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26e9e9da0fc8972…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 19:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3bab3f41555c24fd3abd1bf50710b40 SHA-1: 844477e70793aec5f8cbf8e647fee2806f255555 SHA-256: a26e9e9da0fc897264d5f8f3c42f20aaed92a0d0a19d040940d7b72040a76f2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://indigobaby.eu/upload/files/76512365299.pdf In PDF document text
    • https://dadesigning.com/daduserfiles/files/39833488191.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/52094361971.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613e93a65b322---kofudomozokafukuwawoguv.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/99036494097.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/wogup.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614100df0b8f0---burabisexujulikarizov.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/folemom.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/zexipo.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/bubowitavimuwutevu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/t93ccm52ekltnbii9kt1irb796/15963111288.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/36673074738.pdfIn PDF document text
    • https://shibbirs.com/media/files/21788072574.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/70299436875.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210913130817.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/35707444744.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/31811268560.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/20831694027.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/mabupajupumimedufegovan.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/77695973973.pdfIn PDF document text
    • https://phr4u.com/files/xatituditunodawalomuv.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/68549498312.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/92562066906.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/73589522586.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/94680978445.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/77593511392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+use+android+studio+for+beginnersPDF link annotation
    • 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_off0000b6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FE 16700 bytes
SHA-256: e23b687e3ee177eb8703315f7b715bf8d9b0e7c52c8e071562fa18d6c5670e1a
font_01_sfnt_off0000e156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 10800 bytes
SHA-256: fd0ade76aafdd0c181d7eb8292b98ba83af45e04231be89da8d9492f5bda145c

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