Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf04dee1a30a6ed5…

MALICIOUS

PDF

97.6 KB Created: 2021-09-01 05:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 47a7a07ed35a278bcfc3eba77dba918b SHA-1: 0d8085693bd1978192a6fb746cd6baa82b7f8f03 SHA-256: cf04dee1a30a6ed5bffeaac9a8aca8aa3e8658c962e7e7e98566f2cf605a5d3d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=red+flags+card+game+pdf PDF link annotation
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aac9a411fff---3976225995.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa776c7868---96198906495.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/dimazojijibugotosarigo.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/63476060802.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5582c1514f---63497624419.pdfIn PDF document text
    • https://bczenekar.hu/files/file/varosujenoxotubabegefiwu.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/83075028991.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe5b769dc5---61880978938.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/57966242434.pdfIn PDF document text
    • https://roc.mn/uploads/files/49351733679.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/1676115b2c32fc6f3a52567d71fb32a9/fulomubesi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161155c09d9c70---watazonofilufuxa.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bddb9f067---97250366474.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094610d82e4b---nunajivadok.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/zelanuwosepaxelad.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/zizujoxev.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/47019382246.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d548e9924a---tiwutazogozoditoki.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/zixavibivuneriviwipe.pdfIn PDF document text
    • https://aromamarketing.md/img/files/sulinevusuzofit.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/23091039867.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077200050e6c---23279731150.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/jagozet.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/75499674866.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_off000119ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CA 17824 bytes
SHA-256: 393ea1a9b7d5f0da78bed2cd5f33d468fe5df5b0b120cdec6d4590b406976eb7
font_01_sfnt_off0001479a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479A 10596 bytes
SHA-256: 83a4b4dd923537d11f8075f7477e892464dc98eba582ef70194d50f2d761dc9c
font_02_sfnt_off00015f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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