Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a1c47c0d096396…

MALICIOUS

PDF

81.9 KB Created: 2021-08-20 09:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e468f1fdce35e10969d85c350397a43 SHA-1: d36ee10d729b4e18e16990ccd29d4d56d50f211d SHA-256: 12a1c47c0d0963965236d2ed868a49db60e0c9f0c5c560cd3bbf1fe16f9ea4bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or phishing campaigns. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=que+puedo+tomar+para+estre%C3%B1imiento+en+el+embarazo PDF link annotation
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a11e5453758---xodefisanekomazidexefin.pdfIn PDF document text
    • https://eventaipei.com/upload/files/7722609972.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/057598ba55aa5597f6bd08b2c539626b/66722719150.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/91559868221.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/90331207276.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16076e54f556a7---62438436478.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fixixaxiwiwaz.pdfIn PDF document text
    • http://nensi.si/upload/file/valalawetojinusevinerut.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6f0527d72d24214e6e61c87c4ab028fc/35475915763.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/48767048479.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1e7e067ab9a8bd61626bd2412269d043/17661894006.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/96272172092.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/jjth8ciopkfr80jhlds4leksbm/wasufaxigaw.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/k8g6egmto305ltv1p88s0qepql/lutukunun.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8c64738a46---koruwuwilagivifusozori.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c0b231ca5---58237473968.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/tejaxitozupudisu.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/28c9eee00f2b40589e9661c524eac0f6/82770143897.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/59200093423.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/7f71026d6c90fbdd0d1d40da4902ee33/77352930150.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/tenixotapubeji.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/garodoluxalujuxelejusoxu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c952a92d900---30458207104.pdfIn PDF document text
    • 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_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 11116 bytes
SHA-256: 5bdf85a9482947dabac9d399756730c71f471982d960d3ef3889320d7d434435
font_02_sfnt_off00010bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 17264 bytes
SHA-256: f6be97af6fb80d72f7b27f87d28fcb4361fb2119238a76ce7740e26714a2cd27

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