Malicious PDF — malware analysis report

Static analysis result for SHA-256 05910d5e5b3d03a4…

MALICIOUS

PDF

70.7 KB Created: 2021-06-29 23:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2df008b16bb34a961f2296cf7a5501b1 SHA-1: 8fcf88f2d2bac15f93f8346c968203e6754eb04b SHA-256: 05910d5e5b3d03a487bed40e3c723718ba71ef846f16a95b5491f3fc6f8232b9
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised websites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://china-baby-clothes.com/d/files/37693256826.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/4845277312.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/vuxibijepuzoweko.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608133f06fd88---birujusof.pdf
    • https://baohohoanglong.com/userfiles/file/zukodoz.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qkmj3k0aomt6gi8o81b58c4m74/33041920447.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/6face9ad71e0db26e21fd25732287496/84595530972.pdf
    • http://vistobrasil.net/uploads/file/jitirarobakino.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce891293bf---gexerepo.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/bikagoduwabebopuweruzatu.pdf
    • https://kurtoglumob.com/upload/file/datogigaxowozusewebakixi.pdf
    • http://akcjonariusz.com/UserFiles/file/33535477735.pdf
    • http://driver-jazda.pl/upload/file/33279779364.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608012b7d4de0---fofetomulan.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa62e2272---85170429135.pdf
    • http://emeat.ru/var/files/41375391941.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/76ifibn8f9krbjrcvq022nn3fv/tonukiwakod.pdf
    • http://kstarsmall.net/userfiles/file///tedun.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8edf9de26ac3fbd5f5a259a26fab0ac/ruxewupixereteto.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b81ad590fd112e8ca201fe2dfca3e71d/vidifakevilewog.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d7831cec---nokivowizi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+many+ounces+is+50ml+to+oz
    • 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_off0000b5d4.bin
34c81f859b7e07cf8761ef0e331130de7ca1bb48e00d624742de6b22660d46ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D4 15032 bytes
font_01_sfnt_off0000dc49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 16792 bytes
font_02_sfnt_off0000f460.bin
3e0c37b2b70a0e6d766433b2ace96165a4879991e127736b6aa2e23f6b40ce92
pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 10896 bytes