Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5dd736668ae944…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 10:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 010fe0003fff422b477d87b1213ac613 SHA-1: dd6d40eb1e76c005301ca2fe7701794ae314cd5d SHA-256: cb5dd736668ae944d2079ae25f3a065a07f158fbe1b8aa6a29d61817263f420b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed for SEO poisoning or phishing. ClamAV detection and ML classification strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=valve+timing+diagram+for+4+stroke+engine+pdf PDF link annotation
    • https://weeb.nu/userfiles/file/87468632061.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5ff3fe725bc89c0735959b9545f8cd7f/fezururutun.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/472d1762b634370464e127296a22c26e/87206814948.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3bbfc3ddc5---71134363175.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118122ec6721---gobape.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tfiiol8q5rcelb6o2e08n9iee1/62016908622.pdfIn PDF document text
    • https://emmaushuis.org/pages/92281979263.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/41827091813.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/36075279795.pdfIn PDF document text
    • https://digireg.at/upload/2975618685.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/94133033213.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/vumabadidorowesivanon.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16118494269274---faxavonawi.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/balurikumikegij.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/63173733425.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16123a1dc27729---72871339016.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/5b2fc6743a6d422057e2ebb8405a34c2/73934894859.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/96614926624.pdfIn PDF document text
    • https://landbar.com/upload/files/xolefup.pdfIn PDF document text
    • http://edeins.com/userfiles/file/71720442620.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ud0vg5nk5mk277crd911meb4f7/89786722664.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937d3ea3fd2---38373005699.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d466ca7d44---88201176640.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/0crk2vt9q7krvo75o5gvbf0ta3/73223953321.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_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 18552 bytes
SHA-256: 2a80a39b270c897dcfcc31d0524aa036e25e9c9fb57b8e69783418d18b358251
font_02_sfnt_off00012fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCE 11048 bytes
SHA-256: ac7897551ed8ef6712a3aa82c1b6e15a405ca81d0f912a1cd132f0bfb7da2c84

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