Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed53798f7d2192c7…

MALICIOUS

PDF

89.1 KB Created: 2021-06-28 00:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21676bfbb99b3a1ca7805192361ebde4 SHA-1: ad8716b4584102ba84613e82d9f36eb031ac1515 SHA-256: ed53798f7d2192c7d2b35f878a4f3699170bf1d1bdb76b005109890f9e54d253
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 ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=ranked+high+school+basketball+players+2020
    • https://thefertilizergranulator.com/d/files/datokitakivuserulidizo.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6dceb20b7---33409400255.pdf
    • http://cesurmakina.com/userfiles/file/vibekuzupigogarapisew.pdf
    • http://dinskayarealty.ru/media/file/gunubebogexawijozo.pdf
    • https://rivaflo-south.in/userfiles/files/losevazudilomoka.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/lv2crd54jdhf4cvsk9imi3vfgm/vajobalanupo.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608228baba05c---17903077467.pdf
    • http://pspectr.ru/userfiles/file/27513176214.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c78d4a5c2---57068959350.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/d81g693j5jd2cq9dg0d2oob4n6/bipoludenikaxesoven.pdf
    • http://akinmedical.com/uploads/file/fuzuzanewuvazetufarikew.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6ddd8f4d588cb04ca9987b3171cb1031/87521701682.pdf
    • http://kameleonhastanc.hu/files/file/46293031313.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c492ccc708f---xexitudanawefunep.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b0c8895e31c0fa2ad75bf32c580a9928/migimuw.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2a1cc9a19---kisanugaduritagaza.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5aa1e4f97---ketafi.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5131ed9628---87093828650.pdf
    • http://vanxuantravel.com/upload/files/99717995812.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d8bbc75d34b73ddfedfed76e3a1b142f/nalivazefolejovumogepan.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c3c6507e1---tufiteridox.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d787ed575e0---venozu.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/773mu070923hqq7rk7u2hfje7u/temuxuvazababanuwite.pdf
    • https://dm288.com/slicice/file/43998813957.pdf
    • http://pi-consulting.ch/download/putosoranefufadapo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f82e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 16792 bytes
font_01_sfnt_off00011045.bin
9a16a6cd699d301a48e53d9cfed95b2d663af7ae1c39d8f52f2e743004af8d06
pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 11428 bytes
font_02_sfnt_off00012acc.bin
34cde4ae5b662dcea02b637e320a21e88054f6b60c1dcee6d55730a8fe54b227
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACC 16856 bytes