Malicious PDF — malware analysis report

Static analysis result for SHA-256 49030f2bdda7772f…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 22:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df89e13467331d0fe2932ae40603ccd2 SHA-1: 52c458cda5fba774d85527b05f398dbc5afd1995 SHA-256: 49030f2bdda7772ffb0b9fd5604c5401f3328541476a39e5b56c9fc4ab86aeb6
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to exploit users through phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.awakohchang.com/image/upload/File/egopoxoxijifebigeraw.pdf In PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/sapizixalabo.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/a12765914170297498da61ceb2f56ba1/vizixosokiligu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lp38lad6gem9a2toqk4clar833/dumexisojibazukuninopix.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160faddddb24eb---denipodugetexeso.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab63d5d0da0---29196847293.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/4d440d240b1d8580825c77d3a9154fb2/limalolujivesijuguwumob.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a937f742870---96040049944.pdfIn PDF document text
    • https://techlan.pl/files/file/petekoveta.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/guwimar.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8a201671d---30377421156.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb2be4da3f---57321816238.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/9dc46e50a10088d0d0dedcb362c4b06c/podulituzigi.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/9119861516.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/naxax.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/53b825d958757d0f8e351839f3809141/5749565853.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dee4e049ae3---2130755218.pdfIn PDF document text
    • http://saydersan.com/firma/files/nereludofefanamoralod.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/28941582895.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2ff60541768762299e4926303974ed56/4901604086.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/gemux.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/pewatelibubaludijusi.pdfIn PDF document text
    • https://wildnaturetravel.com/File/8700105248.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f5eaf4b3965---17498896576.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/9df003dbd2a9e338a0f0536792aaa59b/mabusodaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=do+race+cars+have+manual+transmissionsPDF 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_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 10660 bytes
SHA-256: f815d865003a7b9a0184e00c6db7f3cfdd145b3c75f98df77e76da63c3379c40
font_01_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 16844 bytes
SHA-256: c75e7af14742de565e67188b76f6b2a954c0c0a453f45d1f2f4097c738ccba13
font_02_sfnt_off00013064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1