Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d89a0bd2c0b07cc…

MALICIOUS

PDF

95.4 KB Created: 2021-07-07 14:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a401eeda7a5a9d5551c0dc985b761209 SHA-1: 42b33a1a4db24f3437793e12907db27662ff5c57 SHA-256: 4d89a0bd2c0b07ccb04251d9e0703400f274fa15289fca10cd2474a798f08ef5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://nomylo.ru/uplcv?utm_term=a+quiet+place+2+watch+online+for+free
    • http://goldenpeak.it/userfiles/files/87459262321.pdf
    • http://geyikkimya.com/userfiles/upload/file/bipenenuzubuvevovu.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/94198139584.pdf
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/91513133437.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2c4fe058f---56429813063.pdf
    • http://stellar.ru/ckfinder/userfiles/files/sujodojopoxukaropegex.pdf
    • http://kapli74.ru/upload_picture/fitimoto.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160843b3d78313---61989619525.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/fed89eb721a943dc1e7372674a35fd19/24418498417.pdf
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/xopuvejizi.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7gk63l6kmij2fslkjpql0m0bs6/pojorapamadakaxigewivoz.pdf
    • http://jyotiacademicpress.org/uploads/file/vaxikewufedigag.pdf
    • http://maraulsan.com/ckfinder/userfiles/files/lifijelotepisakinu.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kogosumotewifizupesumibu.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/20022bb3ea89dd4812d8e050437d66ba/bijozogova.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a390f9827fc---golodegapubagemudi.pdf
    • http://xiaohecollege.com/d/files/wofufagufi.pdf
    • https://jakspravnenapsa.cz/userfiles/file/joxivumosozivem.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160df9cd4371f4---nenipakuwesesuv.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2ab3fbe08b0c57f4536ee6d9fc20be5c/wiled.pdf
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/51876317905.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/3rgbvlh7qnnra4j6kts0n64pvj/bowizeximapejiz.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/nolavuwolosazedikoluvisas.pdf
    • http://taiyoaquris.cn/upload/userfiles/files/20210530054420.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_off0001114a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1114A 16792 bytes
font_01_sfnt_off00012961.bin
89d4fca30e11f739aa938c33eaa3a2f2fc3ba6bceedea46161a79a8dae1b3b8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 10840 bytes
font_02_sfnt_off00014276.bin
0025a1645cd4317fc084764708bf6272d25fb82279dca1396db4d4334ed425ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x14276 16984 bytes