Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87481280062906a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 11:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4bdf8d194460f65f597d58d25b8d4466 SHA-1: 3e94b140e279bffec98071c6d6ed65fbdb47763c SHA-256: f87481280062906a4d5f0a3c8742a984f528df0d58ac0dbe3e6825d0e57dc309
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://slp70.com/clients/873855/File/robemataximoxuruwelagagos.pdf In PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/narogawudokivurodotejel.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd561a41f5d---12257494007.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/81511722617.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c292e809c11bc0eb22b3274ac43e1fab/46149103403.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/15157599736.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/jizupovuremugomaba.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f585103de55416c8aa1c3cb1a160450a/18017655966.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1b392690---39425660742.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/lnq770lne3a7fchdrekjjh0hfm/70668890329.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5cae4bac5c8d4cf9163b59f9c5773391/sijenex.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/eeljdrbugnld846smg5bo74l9t/lekisolawar.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/ribosatededuzajozuzizip.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/74144466621.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8fb09320f---76367752092.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/qvma0pvrc9a52rncik1i4biqra/mupakesilif.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/pekam.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1627883157.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608359efa493f---99603885526.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9bff8f4e40004e5c343ddaa454bfab7b/49960915968.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/sifaf.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/molewinetuxaf.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/64250864409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=a+year+of+magical+thinking+pdfPDF 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_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 18544 bytes
SHA-256: 998cafffde6f9ab531a0093c89afc00986334c21f410b4fc504800492ff072f7
font_01_sfnt_off000113f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0B 11088 bytes
SHA-256: 636654b6ff62cf659ee7d7340086cb5606fa3ae04063dc7c49f5a135defe5138

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