Malicious PDF — malware analysis report

Static analysis result for SHA-256 342cf35ba140802a…

MALICIOUS

PDF

89.5 KB Created: 2021-07-09 23:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 67a9c153d9b2330e00156558ab7497c5 SHA-1: 3f84022e9fc23e3a38b632ca30e62ade06026edf SHA-256: 342cf35ba140802a142869c1a6d35640cf4d4d49275cbb8b61fb1a0823eee9c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm that directs users to multiple websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c9a1a2ef1310725e2b0f832c5590df54/52100105437.pdf In PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad42efa8a03---72064200326.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/0mrbuoiuv2remf88fqdsfr2fu0/75871514776.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e8f9a61e---ruxosaluromoj.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/zopusujobena.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/85d51dddb826d2cfb58f59098846844a/putasi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16090e0eaa7674---pugilibijesazon.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/rolomadunivupedogujuve.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc128c9533---72650304945.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0927ad72---tisekedimukazatojinumis.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/nopumor.pdfIn PDF document text
    • https://termofriz.rs//files/97264147363.pdfIn PDF document text
    • http://bakoca.hu/files/file/95221028121.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/47bd0512d9bfe52069912d4aafd2fc9e/jaguzuvixerudixaxipop.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160e443919113b---gonufixogoriratire.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d350076d7c1---9135016050.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/adk7badv8uenb8u6dh0mui0280/duxasegozisipiru.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/sigazutubetisanozefubexo.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/xuluvadigoduboxibima.pdfIn PDF document text
    • https://strechybenesov.cz/content/jumamize.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/pupurapugadosenovenazedu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a22f12463a2a95dcd1523165a4a4984e/77711983468.pdfIn PDF document text
    • http://saptpadi.com/files/file/4569512572.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/zodamowetidujukilurogele.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62a9bba501---fejirukonifunovamuxezoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=jobs+in+film+industry+for+freshersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 10804 bytes
SHA-256: b086480b425b7fcfe9ca3a41a067fd5cf22362c31c8bb9c9feb3ea603f710015
font_01_sfnt_off00011158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11158 18172 bytes
SHA-256: 7ddd014187e299ad5f0a1963622f53c310a60fa2cd5985debfd485b6641286d2
font_02_sfnt_off000140b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1