Malicious PDF — malware analysis report

Static analysis result for SHA-256 3663c207740bb52c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 14:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ccd635d8e7c9c8f19ab63de6ee8fa2f1 SHA-1: 5b64e2b6b40cf5b5c818ca5e3cbcff0efee2ae6d SHA-256: 3663c207740bb52c2bfb8bc32147f13b2e8a74a6d9eddefda80bdd7c1465cfb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, directing users to download software, as indicated by the 'utm_term=windows+7+daz+download' parameter in one URL. Several of these links point to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=windows+7+daz+download PDF link annotation
    • http://jamesandsons.ca/userfiles/file/23189831736.pdfIn PDF document text
    • http://forti.in/userfiles/file/13304114147.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1f23a5bc2e7345419ebef9c2a694c2dd/gatonakoziw.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/vajud.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/59252491023.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/pakuruzupowibedaxizepekel.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/jidaxotolajuvizeve.pdfIn PDF document text
    • http://sjhtractor.com/d/files/92520899078.pdfIn PDF document text
    • https://5udua.com/contents/files/13583913350.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/45530389236.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/69754165587.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1a98528c599e78df8779862e7bd343e3/8103817597.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/7255150737.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/32907471857.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/bajeratelunulekopeguretaf.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/33179826253.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/55709402445.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/83346843182.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16139280bebdf9---borozupex.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb4a4a1f43---fupiperepoketitok.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/movetolugemujepewowo.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/nubazitogaxobojefer.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/78304023167.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/90890916668.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/nakibafetazewapofete.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_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 10100 bytes
SHA-256: f7cf334bddda11d4827900cfaae93dfc8b30b8482a3ebd35720894ea54d8dbf1
font_01_sfnt_off0000f86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11081 16484 bytes
SHA-256: 24e241cf66cdd77ca4fe032fbe6048e367eb24742b8996044a7eb6e48c35bdb3

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