Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d8a1aeac4b46f1…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 14:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0bdde95aeb243c1b131ae89d8d572ac7 SHA-1: 6497c54b9f23640eaa7b4b58d225562a8d5baf0a SHA-256: 67d8a1aeac4b46f1968a018c2430ff96b9160829a120eb1571f8e25c15f85841
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on potentially compromised or disposable hosting. Multiple URLs extracted from the PDF point to suspicious PDF files, suggesting a distribution mechanism for further malicious content. The PDF's structure and embedded links align with common phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://botosani.ro/img/uploads/file/pabumatodevaxupojige.pdf In PDF document text
    • http://bpsstudio.hu/uploads/samenitok.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15cd1308ae---dedopapab.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/piteriripedimot.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078e539d84b4---53461588011.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/xojapa.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/12281764972.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/59711037698.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/19699203863.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071be7b67b00---40272712132.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6b9869860adeb4acaf13be6d385a921a/66525352850.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/lalanaxanadafuduzipavur.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210627195320.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c01f447787c---tusajewudumik.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/1a600ts68nmcvrjgjd76f4dodc/56801607530.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/sijotedopusipaweboj.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/41654708671.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/15229243751.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/246a84e913f879a6344e17137089a866/63858921273.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160863268b6b98---pexerunotex.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/80641345482.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/74002391738.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/nowukojibusavawov.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931ca36e3bb---70061181858.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/e60bcfa42e619b00be8313c91a8bb6a1/48806075282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=duck+song+lyrics+pdfPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210826/16299398064205.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_off0000c854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 10708 bytes
SHA-256: e8e254629264339001fde944075ff5fab0a868b557be604e8df9f28aaa85f3a4
font_02_sfnt_off0000f8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 17308 bytes
SHA-256: fc252bcb7cd5a1fe1774d26c707c9f941a68181a33c20d3eb91890934d0e28b0