Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac826b4a6f3778d8…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 13:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4105363703ccf877d3073454c68e8041 SHA-1: 7ff03e7d9a3c996ae522b9784f4d85a840a11565 SHA-256: ac826b4a6f3778d872c8186e9099d8b68c06bd56e926a84da093d4b74a0e21de
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=snarky+puppy+lingus+bass+pdf PDF link annotation
    • http://dakmoto.cz/obrazky/file/jawegutepipijefaxo.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/3255458572.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb6a6349cb---650471715.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/ritasisupusizun.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/negekapowufuxet.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/ecf1752bf945588844874992a078fde0/masemekusezowakulinisure.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/gekiw.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086970e769ec---50211184270.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/31409915421.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210624_057F93ACE2D2DD5B.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3570eacdd---zifafu.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/jojudu.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/89562951496.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/22b7a29f1a573284cd76cc62e024dc31/12947662844.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/fojenuladavojajujot.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/1945448825.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/madizeliv.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b10d11a1f---vuzubizivowewodoxirovutat.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/g5sq3k3k10l5nljv2mkbnq8juu/66955536292.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f9fa0e517---wukudafosexuzenira.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/xiguroba.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acaadb377d---mopineremexofezazapa.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_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 18504 bytes
SHA-256: 611916787ca3c8f21064de3752480cdaf9d1727bc8957a2df3b9671409a7a857
font_01_sfnt_off000112f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B08 10844 bytes
SHA-256: b31bde92ef8e8addb198a0ea1cd9ecb1da7549bcaf5352d3aa5b0279c82314a7

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