Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cc1d30417e412f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 18:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2ef73dc825c1320ea22224e887ebd06c SHA-1: 71488df81eabf0500128ac77eafbde5cb3e1fe44 SHA-256: 36cc1d30417e412ffa76575af7006dca56248a7833e07ac2164636e4497fffaf
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various external URLs, many hosted on compromised WordPress sites or disposable domains. These links likely serve as a lure to download a secondary payload, such as malware, under the guise of an application download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=download+app+vidmix PDF link annotation
    • http://bearings-home.com/userfiles/file/jupejuzadubi.pdfIn PDF document text
    • http://martonelektro.hu/files/file/mubabum.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/59476726722.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/sotaxusis.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/96443269099.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210908013416.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/78111771291.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/befipesewokorijufu.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/senedinixij.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/vetizudikomov.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/panuwadoxadibajovapofar.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f89c888d76054464ee658fa6981ef639/40169103591.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/sesatas.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/nr47un5988005063057vgeqr85/29010964944.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/68268143162.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/napikoparegepi.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/jikimadit.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/mejexuxobekexu.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/rigowuzubogoladesuje.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/79455592968.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/vatamu.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/keguva.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/gelidesore.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161331ad817170---98129627989.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_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 17976 bytes
SHA-256: d233fd4744c8e2a206d8e58c809af1c1459e57904b0b1aa3a4dce0102c2659e0
font_01_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001204e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204E 10312 bytes
SHA-256: c9518eca87721b64a6aecbd5d942f33105c59661f150654fad4cf64df3a7c56a