Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade6d62c0cbd24e7…

MALICIOUS

PDF

96.1 KB Created: 2021-06-25 17:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b478d4f764c5a022ebb6574e51ed4345 SHA-1: 86d99d33695808fec25ec88fbc4fa09169193e8a SHA-256: ade6d62c0cbd24e70f1b715cb361cbe227ace540e21cd0d10ccfe17cf9e166ab
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://catamma.ru/uplcv?utm_term=grade+11+maths+questions+and+answers
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/3685e68adbbfbda6893705a1532ee1bb/75592597395.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a89984faf40640c521513d7ce5feca92/31301228514.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ced1e186d6---nidoxesigajorar.pdf
    • http://beerskiboot.com/img/upload/file/84757433963.pdf
    • http://unsersohn.ch/images/file/9492074631.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a72fd1027c2---misovopitevufo.pdf
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/6v78rd7tqbn9765l6bsbreja7s/bepibo.pdf
    • http://evevoyance.fr/adh/.-/file/43060150622.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852dc14a154---1288653980.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/16489882910.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9rg2t1dp1c6tjk6v200f9ngtc/bexawes.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54779968387.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/jqa9v0ap9fr1gntho1sqac97km/77032796843.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2263456db---88422370205.pdf
    • http://tai-yang.tw/taiyang/upload/file/fexale.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925682a4e5f---99870748608.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69271520b---menusan.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0a179c0a1160483874c7f02046715e02/36871529601.pdf
    • http://viprealestatebrokers.com/userfiles/files/sewoxademos.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60e05804e---85581398228.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/uljh9rdufb5dk9nnnn0mehrfij/foxamodekebudu.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/85f3548d2ff47754dfc7d30c97ef19df/pokudufuganuwavodadajaf.pdf
    • https://btcauction.vn/hinhanh/file/76338590594.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dde85413f---77454684872.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f893.bin
ec92cb7765eae456276cca03f1e83a75147f7e229fc1cedfc46ecca8635c6233		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 10892 bytes
font_01_sfnt_off00011188.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11188 16792 bytes
font_02_sfnt_off0001299a.bin
e3d10bc10f2af291158ed9b97aecb168ee0776721aa5de4d2e71265ab4efc7b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 19196 bytes
font_03_sfnt_off00015d40.bin
0491ab1f9781984131449868ed95f15036bddabad70a51597ae233fa8bdf08d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D40 16076 bytes

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