Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd879c9558621124…

MALICIOUS

PDF

89.1 KB Created: 2021-08-12 06:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 69f695571039201a2fa3bcccf29ac472 SHA-1: c320af4b2fc2bc101a06951495e5f09c2efbe79e SHA-256: cd879c9558621124ea514875003a114d02eede097699eff540dd9c6b244a8a74
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://hifitness.hu/userfiles/file/sikivuxajuzakelexovesa.pdf In PDF document text
    • http://ippon.lv/uploads/File/76932317443.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/fefikibifigezanisezu.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/zezeki.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/mivejoneluperajijude.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/g85hvadercajecuqsn5ggcimh5/bajezunobakipod.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4e03fe42acffb24a5888ace6a54af5cd/danuzuwivelosoliweloj.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbea6033c0---12314089448.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/073538494b748821fa68f4726888c7a5/saxuv.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c467cd1f631---14045401829.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/be03a455676ca058f5a4943ef5f24b9f/wakodewowexufaf.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/ddc7981daa36c28d967efb8397bd65c3/95015755954.pdfIn PDF document text
    • http://iphysiology.ru/upload/xujunizaxebupojuvefitafe.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/nakufofigasavisifebasexar.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210710111718111.pdfIn PDF document text
    • http://dienmattroigiatot.com/uploads/files/ravesolanogobojogituzun.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/b45a53abps3ioe6vvrsgijjav1/91804901333.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/nemipupefusokagafejiwe.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wijasinomusujifiravisaj.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/ribara.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/kofisuxotofofedukanege.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/1467930b6c090342a4e95806f854e419/sesosetafebilutoraj.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160912191115d3---zegutefe.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a7ca30e73---46808938857.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16081335fbdb3e---panigunewirewor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+install+fridge+ice+maker+linePDF link annotation
    • 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_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 17400 bytes
SHA-256: 4f3d9e755d9ddbb797399e4e29f4e28d25f13826c3da74c900ad5a71465049b6
font_02_sfnt_off00013c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0C 10988 bytes
SHA-256: 7451f1c7a9dd74818e1591293b2fbca6288b0fa0f760a6c1cb3598dcaf2719f2