Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6cdeba4e3d0222…

MALICIOUS

PDF

78.7 KB Created: 2021-07-20 01:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8f8c710b79d49aa4f8b730c851601b4 SHA-1: c3648da43e22603f3545a1ddaeb19375c34fb1ab SHA-256: fb6cdeba4e3d02228a37ea6d62dfd9e24c28ea1253fdca6691ce5c09e38c7d15
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress upload storage or disposable hosting, suggesting it's designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a link farm used for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://vietsonplastic.com/uploads/userfiles/file/jokoxikotuwiga.pdf
    • http://mai-colle.jp/userfiles/file/10991286249.pdf
    • http://tylerdaynursery.org/clients/8/8e/8ed7c4ff1d995b028c1180c1bccb3f4a/File/wadawitikax.pdf
    • http://medicamarsala.it/userfiles/files/56193471715.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c3cdd3d5---810649260.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210717_96AAFF03222641AB.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf29dcb44f---fafuf.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/jazilutefudewobinulib.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160df52788b73d---xopibinovifuzuxedugatofa.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c1438135c---75237771049.pdf
    • https://dbjadow.pl/attachments/file/pemoto.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859f9900dc2---pivedepugulofejigabonid.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/33f9f0fb58448daa0889cf262ff8174d/mejarapiwojisita.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b974ad98e507ef4b930c1c36f05a0e7f/82323184042.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d48572ceac91a9e8a0968677d27e8350/kelezaworamuxoxejajar.pdf
    • https://alshaabcoop.com/userfiles/file/20987653718.pdf
    • http://locnuocvietmy.com/Images_upload/files/72407979509.pdf
    • https://ville-saintleonard.fr/pdf/denijabazodimuxinokerej.pdf
    • https://istanajp2.com/contents//files/pejomilevom.pdf
    • http://skybuildinfraprojects.com/uploads/30428321120.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/fujawutazovasezogaxozemux.pdf
    • http://antonioruizabogados.es/userfiles/file/46871437622.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=twin+falls+state+park+wv
    • 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_off0000cf6a.bin
03cbb09eac0ee7e06790cc2151191ff5668630613d979021412db0e8d9de3baa
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6A 17300 bytes
font_01_sfnt_off0000fc61.bin
6bf579a4cf2b0166d555b3062b36f601f0709170f4d13b6d594a33dbede7525f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 10440 bytes
font_02_sfnt_off0001143f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1143F 16792 bytes