Malicious PDF — malware analysis report

Static analysis result for SHA-256 749c9bf0e7bcca63…

MALICIOUS

PDF

90.3 KB Created: 2021-07-19 08:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7cfc9701c77270a3d0548e1c1c8f542d SHA-1: 29599562d401fafe340944953f5ae7541f532218 SHA-256: 749c9bf0e7bcca63a4860639b3862cc61b976768e6ebfb1901c8a1b8107c62df
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The presence of external URIs and link farm characteristics strongly supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d07c5d3fa---vakuzaxomasutegulakube.pdf In PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e3f0a9f36248c2c24cf7f9f40ef1efc5/31728004474.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b77f20f19ac---ripusufobatupe.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/59676694377.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/3826822964.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/40964983860b8a83007417.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/76bfqreqgmlot7kmt7uhb77fuc/fozebupimodelitegezefo.pdfIn PDF document text
    • http://armanetti.com/images/samodi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608255751240d---56971970020.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/gabekekajejekabemopuzowut.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608611c55e594---17253675814.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/bovomexulezovo.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/24ah8h8lep6g9kdl1mjiamv1cv/zozegamogogivogajuxi.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/16397997877.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/1781595520.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ckfdbahi7uo7hu9tt0a49ssgj/korerevazojiweboropom.pdfIn PDF document text
    • https://ka-base.no/images_content/file/26826438755.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e233a28cb704e2d871d02d0e5758e95e/wubixa.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d29da8281---xepuwarusozofotegolaxu.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/nawejuxu.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/panugipudojazixoxenu.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f59c31ac7---73740831522.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/getojevileg.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b3df719e199---boluresakubadafeginef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wavelets+and+multiresolution+processing+in+digital+image+processingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 16328 bytes
SHA-256: 290b593d0e7d74f791c400fd22d5f2a305c65c85f323d968cd3b9ebf82b191b8
font_02_sfnt_off00010fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 11016 bytes
SHA-256: ad6b0da091053d34f22d76010813a67ccdaec0f0d6a3d7c3583f7434718793f3
font_03_sfnt_off0001291c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291C 18876 bytes
SHA-256: a9a40c0f3e093d2ccaad19cb83ffe0d2fb4bd50853ba447668ff9f2e4c6acd84

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