Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f6a6e3eb09e219…

MALICIOUS

PDF

84.7 KB Created: 2021-06-26 04:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fdda217e8280c2f6ed43f2aab0e93b20 SHA-1: d3ca46bbad89c21c525527782025f6b08c888eae SHA-256: 26f6a6e3eb09e21996fe640076b0858f5e5ad411d79c04e99511b6e3e7c3f67a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure suggest potential for JavaScript execution to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=oil+prices+live PDF link annotation
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b44a65776---1227126480.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/70befead52315c909dcd2bdbb5fbf748/fopotud.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e24b6bcf65---giduvobavakizatawufot.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/gitejepewamowadaxe.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b392366f0e95b912e88accdd649d1b96/21008751836.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/xiwebisupozozakejutarune.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/15993667157.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/vefazuripekev.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/towedurejibesuzavuku.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/gafojutubitekabimed.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/kolamokefek.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/prkrqqhkoijml01bl67ishbrib/16128234763.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f93cbc560---newimugokololazetodike.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/dotanum.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/fivogefuvenifemedumija.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/dmvnvuftv3bhundjee4mrpm7p3/biwufifagexisazu.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/hd248tl12jisu3amohpbgkpj15/33542985831.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/dozolomoxupalojusakotawo.pdfIn PDF document text
    • https://actor-conseil.com/files/file/34206086845.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/75130886152.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b68f31d95d---4438536481.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7ecbb53b1---baximevix.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad2a51cbf---susozabatokasagujowuro.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/60700211bee6df88c9acba4e0e5ae2eb/15939438134.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_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 9972 bytes
SHA-256: 5baed8743dfcb0e9cf0ba5b6d44e0195bada9e87943bbc7569bd255af46d37de
font_01_sfnt_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001193a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193A 17072 bytes
SHA-256: 672b75b84dde26149763ac8a237bfb9c25477bb7d57dad426f75cef33a9038d2

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