Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b8610dd9b8594a…

MALICIOUS

PDF

100.6 KB Created: 2021-06-27 03:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: facb117d7df7819acb75ceaca592e9ba SHA-1: 902435d1e5523e7ace5cdc2eab85a648d58853d6 SHA-256: 38b8610dd9b8594aad83acd08289813394bac342821e9d7e748725879a4a6f88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI indicators and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://grandhotelbulgaria.com/userfiles/file/83372423325.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6dec37027bb226c79fc2b12f6965b407/davetebidibazuwilovededo.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/16d5a63j5526rgvb4rbgu2ljpt/86963145796.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/16666502018.pdf
    • http://akinmedical.com/uploads/file/gezose.pdf
    • http://liccuza.ro/stiri_files/file/sojukemin.pdf
    • http://randalljroutson.com/clients/44711/File/bapojegesimimisasarotan.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087015ae5955---74530708486.pdf
    • https://batdongsandothanh.vn/luutru/files/juburupuxuzujowofutikimej.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6ee157acb---rateguzemabijiku.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b0fa82f3---xisuwilodag.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bad56b7b3---bobobufivobakakulasakat.pdf
    • https://bamfieldrental.com/userfiles/file/zusowoxafasawopena.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ca5o8agt1epec4guanmksoo9l4/migupagetiwubowizov.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b9851a9982f432142f832237cb85b52/54685618113.pdf
    • https://oxi-dental.ro/imagini_ws/9033828228.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/genofivamuporujedo.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/df52093494edb4c88601ea80521c4e92/36766249696.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f356cd2b6---jufitijituledobobenax.pdf
    • http://ahsaipu.com/v15/Upload/file/202157959597555.pdf
    • https://davaocarrental.com/images/file/fepokumapamotodojili.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/9302395cf42b69a234db82f893c0ba49/duzevaxubixinovoma.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b48ba4ca0f---28680404602.pdf
    • http://brianhaymore.com/images/e/file/zepatemotavoretaduja.pdf
    • http://ontsgoi.shop/uploads/files/8035488167.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=2003+ap+calculus+bc+multiple+choice+answers
    • 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_off000103df.bin
9ac190d581b5265fc54213e93858975af41b850b3d1721a4d9bbce07bd2c447e
pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 20904 bytes
font_01_sfnt_off00013bf3.bin
e43fc55e3820c4046487792ea4ca6bcbad6b1871447794f7c4a099ef34a840bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF3 11280 bytes
font_02_sfnt_off00015628.bin
4a58bb216947a32532c384db766c4dc9d2628d7fe459a625af0d67233394303e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15628 16228 bytes
font_03_sfnt_off00016c10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C10 16792 bytes