Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a93b825affaf30…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 10:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c707ed270d339445371355de2b0354e3 SHA-1: 3bb007d3be0a029b7774bc8cc9e29766fd9a7945 SHA-256: 86a93b825affaf30b7c1377f0eb126a5a0dd46eaedbcd476a5c2140708b006c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/aqbk5tk4fqtu7njsckv7r1hgo8/31907231392.pdf In PDF document text
    • http://huile-de-nigelle.info/userfiles/file/zazipanariteviwaberatema.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/12v38ja1e65umn78jb8pi9glk5/zifagibot.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160947d5f27475---rodogofososevukujavipali.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/ratugijarege.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/71363687087.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38531bb03c---90387676634.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/jon203s8jmi9cabh5gtgfvuk71/16143049654.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/23885469858.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c37d9d3c8c5---lebikirodagezi.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/7109f70f3d1693fba5c39690b98e0280/44586580783.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f29d5eab0bf7a632673686840c8fc323/44791288401.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/73239955376.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/tiguzasemera.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/l4scs7tsu19pjdonk0hrvphrql/nifopilapubi.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/0bae8ef9846e72f581be4bc4f50f8041/65844026166.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160949fc61503f---kurasezofeginama.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210829051516396438970.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/lowosumugowinan.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ab28b7710---duwoliwimelerekimide.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ad49b4a2a---nutadenenusidoxi.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/gunomufam.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210706_EEA65922122732EA.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/31325781897.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/m7hs7plov24jvrssna747nh4i7/81794214078.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075463d27503---24811690903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=schwartz+absite+review+pdf+free+downloadPDF 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_off0000c777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC777 11144 bytes
SHA-256: 09118e4799febc0b69137930407df7144129bd15ee92f31eacda3e3143d75ac0
font_01_sfnt_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 16452 bytes
SHA-256: 87d4463e03cb9f4c3e5694d41019fd334ee92dc8e1db126af1fe432f79c5e95e
font_02_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1