Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8971012633dfd93…

MALICIOUS

PDF

94.1 KB Created: 2021-07-17 00:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 199c1a7e02a720bdc063713bb3e624ff SHA-1: d0b7c84421627c212695df8ba6881979eab64ff3 SHA-256: a8971012633dfd9304ed910b7199e357aebff612740fb67b50ff00dbc23274e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://abwingsbuffalo.com/uploads/files/vinanovofukokegafavodiza.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c531383bbf3---65260088816.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a08b60a276---74083678206.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/83044699019.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca466dd58---zimozo.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/68710320025.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/85780166852.pdfIn PDF document text
    • http://apvn.info/userfiles/file/90364586014.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e5a02a321f395ff1f9b8dff53f5b05fa/20592519894.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kawubigivevogevofofi.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3171d9c20ce6809d8fe3cd7a664295f7/74126680111.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b2cb895934bacbee37c30d7ab38ebb2d/20158554284.pdfIn PDF document text
    • https://digireg.se/upload/sujigunudorixez.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/vomososasejawodugezujix.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7ffef0213136cfa36793fd19daaa868c/62217164574.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/23833973552.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/levikidupove.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/q09piavmcqhos6gj96485oc3qs/3824750372.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6817cd35a---32165991834.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/sazesa.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/dvjdihiiv1dchi3uqv7o940tl9/849509475.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/raxupux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hot+sweats+causesPDF 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_off00010ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EE 17856 bytes
SHA-256: 1f2daaa6781cefc6aa7aa41ce28c613346f04f1ab31aa90124940121e4044e9f
font_02_sfnt_off000154ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154EF 10056 bytes
SHA-256: 06dc0d5db7c17d5a63e5f8df797e4f91f1351815ef66a575b22e4377809d7b94

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