Malicious PDF — malware analysis report

Static analysis result for SHA-256 a213c92d4cc63b9d…

MALICIOUS

PDF

70.2 KB Created: 2021-10-01 10:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c41ec5258faa64eb003d4fd47b625f5 SHA-1: 31b990d7e8943202fd6135a535403fd608ec1a2d SHA-256: a213c92d4cc63b9da06fff4bebddc50ac6fb555e249a62084f845a660a8d9ad2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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=friends+full+episodes+season+1 PDF link annotation
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/fitimi.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/12939013301.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/wiruxotivofexosudigu.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/kazamepezir.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/187432007.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/kamugurivopupurufoji.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/romidukesaruve.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/valumefepavidagalo.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/96130798091.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/a716dc081c9e431911c8fecca60f019e/12454709301.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/9mmemhqh9keu3jf3ak2n18qc94/74869869014.pdfIn PDF document text
    • http://1855-4080.com/userfiles/file/92140803768.pdfIn PDF document text
    • https://laser123.com/geektic/files/zusanijasuba.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f736bdcb93---velidizobanizujatig.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/10997818143.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/mutafiworobawax.pdfIn PDF document text
    • http://signauction.net/userfiles/file/zunalonodijufoseju.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/iqjnsg5ue510psv9bq0pnk6ats/kisumuxerojaf.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///xubonefebizojepafagipowo.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/88441896831.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/jemawazoluxudefuz.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/getemaw.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466e1ad7e75---93413074341.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3d2a3032841e9a719143de74c59e8407/veworazevuvepejip.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/jepizenuxikibunaw.pdfIn PDF document text
    • http://artediapharma.com/upload/files/22505471773.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_off0000b28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28D 15844 bytes
SHA-256: 193f759993e1354a89b1394ecb9ab576e9350c12c49fa49abab0eecc9c5c4fef
font_01_sfnt_off0000dafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 10524 bytes
SHA-256: f38e41a22a934d608ad10720d04bf2eb82c3cf612703df2cfd1ae6ec53e56123

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