Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e71febe45ff152…

MALICIOUS

PDF

128.9 KB Created: 2021-08-05 07:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf4702f26c4fe793b8dccb57a8aeb28c SHA-1: 74d34a2617997b5d2fe35746e27d924cb4877538 SHA-256: 20e71febe45ff152eebe5657ae1c419201a7dddf564be1ddf1345b717e421226
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious or phishing websites, leveraging SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://huntic.ru/uplcv?utm_term=edipo+rey+sofocles+libro+pdf PDF link annotation
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/3164gtrit63pkm96kuv0l82ia0/27941394962.pdfIn PDF document text
    • https://marosme.ro/hirek/file/kefitadibizakuze.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e2abc7cadabbbc416364b7918c80436e/wovegas.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a115c3eed9---mironazenivosubuzewot.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc2366b8b9---posuwelivezezumezedebane.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf63bc372---81942818234.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160731f9febb27---sujenasezisuwefugurit.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/70d5b8a581f98a379e448a7c1795b08a/savilepa.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/86950597149.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/63573015821.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/38670694015.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/wiwapedeso.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b6b455937---netofebipuwosaxovadorik.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ca7c79a9c3095a64ae623e8468b7e514/86803460065.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a9513dffb---gevusofusolapufa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a69b1c0e34a---manowidadowuzuw.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4eff2ad22---futowosefa.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f5fd75c7---serulemadorosow.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/10895582765.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/shti1i2ld3qqte2dpglqip39b7/31188647410.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/78431003513.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160737399f01f8---xozogep.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/83882613477.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/dpk0sgg4lol169j1svaa8r86o5/goxigefemoxuduv.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ktro7o3uq4rh53e023nt7fr0n3/22500587779.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/kbhuhmopu16i9400vg9tkcmhs6/48207583769.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_off00018a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2A6 10484 bytes
SHA-256: db59833e679aebf37c605d64e39af76fcf6f4e2b989bf4da35d350c397f112ac
font_02_sfnt_off0001ba4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA4E 22432 bytes
SHA-256: 03e279f0d31bcab4d6c51fd16e7d5e85b6db0226e7304370a7af86e8d24fcebe

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