Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ac6ffb5d8dae54…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 04:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8d3fc608f4c63347bcd76020c9df970a SHA-1: 5f9abfff9c15705652fc356dcdc9759bae5d16cd SHA-256: 82ac6ffb5d8dae54de9c0946fa4b9530fbe8f644203a6e925815415a68064718
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a phishing lure, as indicated by the 'Pdf.Phishing.Trojan' ClamAV detection and ML classifier flagging. It contains a link farm pointing to multiple distinct hosts, many of which are compromised CMS uploads, suggesting an attempt to distribute malicious content or redirect users to phishing sites. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a malicious intent to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6be7bf5301e528f1c583ccbd85c850f1/72039523359.pdf In PDF document text
    • http://amon-syotengai.com/userfiles/file/wexenopafewe.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeed1589d7---24018554494.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd5ff39a87---62833883800.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/9cf9c897e31b0ba318243a2df14d773d/kezax.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c84f41e28f911cd093d22c11bd2f0dd/39509900997.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/9ab48f6cd6fce18c553faacb79a818c2/nasanezawejojizozopewa.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/31976743012.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/tekagejekelidirid.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/pemupefesixexagok.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/alam1aenropkdi2fnmc83fvq0h/84257596880.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/56bce4be2e7fd3bd0c3a73489f05354c/nuxiwagadas.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b881644d844e6f3fa5dcd6e430cd7841/58277872730.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a89eb930f9---9007124219.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720af29ffca---bawesonuse.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/5dnp7bo4nl15ra6ef8sjrdirdd/32834768190.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/28683903045.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/22451525130.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///disew.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da742f46534---jozudatudud.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/voribilis.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a74a48e4aa821c06a3381df87dc8ba20/tetisomumatezan.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a7cc75c92---jubavo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f09cefb6---44114116388.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/db5b8799a6dc39136e9f66572cfb4ad5/buxafugepewin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=homes+for+sale+in+leawood+ksPDF 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_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 16872 bytes
SHA-256: 2a39bb8dd04af67ce17a3ffd4d49305e72df9cde4461f51070668d2177f65f4c
font_01_sfnt_off00012208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1F 10588 bytes
SHA-256: 87fc2fe9f1cbfd8b083b4178d5dd1a04911b4e357a7ccef6a53b20da9970611d

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