Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7ad48206da42d9…

MALICIOUS

PDF

77.0 KB Created: 2021-09-10 00:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 961feb9229e332ca38a6b38e1364ad65 SHA-1: a110e072972a3e190ed16d51bc4e88066f19862b SHA-256: ea7ad48206da42d94bb63d9b7779ae3ae0ee1cddc38f8cc6cc2bb8bcb79fe3e1
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, 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 distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://ketchas.ru/uplcv?utm_term=m2+pro+vs+redmi+note+9+pro PDF link annotation
    • http://gevenschoenen.nl/ckfinder/userfiles/files/zisenisesadosuke.pdfIn PDF document text
    • https://digireg.nz/upload/gukideziputoxega.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1631132082121785863.pdfIn PDF document text
    • http://ipllaser.in/uploads/51153412319.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/pezatulogomuwik.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e802e08eb---58722614393.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/bedomobu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/je3efi89gm9a1qjrfrl81dse4r/wugamijenaxa.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7627e09e7---40114945588.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/b7m1gmrn1q0efh33s2s3dhgl33/83090366335.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161325cb40c2de---48641605033.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/19833235719.pdfIn PDF document text
    • http://belniig.by/public/file/dadijabinovitibebagigo.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/ginikixalesejabajogirore.pdfIn PDF document text
    • http://portableandcool.com/files/files/jijulevifupetat.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/92853366348.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/39307318087.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/mirebixoroferozalifafiwe.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/fezabiwotad.pdfIn PDF document text
    • http://dkind.net/userData/board/file/39680511730.pdfIn PDF document text
    • http://corkpotters.com/images/10170847473.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/paxenoxeguveb.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/48516918425.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/33865386341.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/vaneba.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_off0000c598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC598 10692 bytes
SHA-256: 3933b1e392096fade95469625280c2f4faf85c23365361364d1c1b73b3b937f1
font_01_sfnt_off0000de35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE35 18500 bytes
SHA-256: fc9e8958c9b0e90c9a37554c027c5fb30a0ea0adb17033a97aee5b76e99ec48a
font_02_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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