Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd13c01f085dafd9…

MALICIOUS

PDF

88.2 KB Created: 2021-09-06 07:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8dd3728d03e1ebc3dd9892535a81ebbf SHA-1: f19f1c1a389712f73653f082e609666619c8a8c8 SHA-256: cd13c01f085dafd9a3d53740ce5380108ba4470ed42b4bb3a62e237a6e011268
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=working+capital+management+project+pdf+free+download PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b978013cccf---19421884608.pdfIn PDF document text
    • http://epicridesnepal.com/files/62291245317.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/13510100067.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/96983303586.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c442cbd05---gixigupojodexotuxukefo.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/81df9187fd9abd75b505b8c0725a7c84/97310875946.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/74220719431.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/xifipurenakaz.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/pimipe.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/bibinaximoture.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/60b7351f60ee125bc411b49741bc1e81/xinusu.pdfIn PDF document text
    • https://adikketiga.com/contents//files/31262714119.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/3d69ec2086755bd8efe43faabf265beb/wapetesoxadazapute.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/dajuva.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/99670571769.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a97851a90d---vagelokol.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/guledajelok.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c0e5c50a6---foxitupegujeneveze.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771515d9d13---48326923220.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/zoxerojaxilibibuke.pdfIn PDF document text
    • http://kgmda.com/upload/files/mirefisubixusewevuv.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/91894815695.pdfIn PDF document text
    • http://andrewclaymonfishing.com/clients/a/a7/a7b0d980ee28df7184f998a87a00dbd5/File/pejaboxaf.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/suduzezajaw.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/lupusedasojoge.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_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 18940 bytes
SHA-256: 1faed39b8f254f2b7a130dbb09f3d01f51b885d4d0a83c9f5f39bf59ed23ec11
font_01_sfnt_off000120b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CC 11096 bytes
SHA-256: 0f15001863bbe1543054f176e9a726bea6453cf438ec23e05692f093b30f22cb

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