Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f633f7eedc7104e…

MALICIOUS

PDF

83.3 KB Created: 2021-08-25 07:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3487d17d29dae8969293a863bc0aa1d9 SHA-1: 76fbe9352d03e48af1c0becdccc7cb179be2214e SHA-256: 5f633f7eedc7104ecc9ed534bd6b0ea426ebc83f0b453394ac659493aefcfef7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://queure.ru/uplcv?utm_term=statistical+analysis+for+categorical+data PDF link annotation
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0145a554e7ada76a9f3965c7a828fc09/nurobijalo.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/vakonemifine.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/34062501712.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc53203201---49636321595.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/resofudefixo.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/xukamovenefi.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/7d9631ab580347e685381abb1c182c29/tunasisiv.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/24802327369.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/4ce4181347e50a4a8a6410c85b02b72a/83255664364.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/bedudorepimatemonapujeg.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/pudikosepofovowo.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/98369341505.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/5c25255845a7474b37bf03724f7cdb77/65025410455.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430140110739564.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/ee9f0c9d7fec46cf00fbd4b0dac11987/jibufoxirojavomosewof.pdfIn PDF document text
    • http://szpk.hu/_user/file/patiginufezokife.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/coacc526gm85g4do7hkm5it34k/faxuvuxenubikelazanusunek.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/78508814829.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612095029ae0b---47313520389.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e38de63745f1e5e633a58aba192d3a0f/zanopegenibufatuziw.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ab74b75d24940a35d304b7bafff4ff0b/ruviwanebuwu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16121a0f0dda82---bepexagejojefazelikodufoj.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/27849266553.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/381afc1d7bbe132322aabaa9bac7bcd2/77215901508.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba49efdc9cd---xoxikeworu.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_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 16776 bytes
SHA-256: c1c14e6abd7381b0471b8d239e1d6298e58482773f2ff5cb64524b936c48b50f
font_01_sfnt_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 10840 bytes
SHA-256: 3df2359329a5100ac82dbf92f444ed9065d1160d1b44e3842b608f2f8aa86d1f
font_02_sfnt_off00012696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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