Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfa7f77a1cd35d9…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 05:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9492c84ed301b8bceacbc1306f47a14 SHA-1: 89d3802813152573ca5860f8e05ef6e6201bfb80 SHA-256: 4bfa7f77a1cd35d9f145bff206a90fb0fea6da36e030405f5c2795583ee3ce81
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains a link farm pointing to multiple compromised websites, many of which host further PDF files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://medvor.ru/uplcv?utm_term=live+movies+online PDF link annotation
    • http://doanekeyes.com/userfiles/docs/lexibikenepe.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6hlduog8rh0bffph9td3ub50c5/61581675375.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/13110857098.pdfIn PDF document text
    • http://cpviettin.com/upload/files/gukavuzukegonuzososevalas.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614518cc8788a---lawajikume.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/janaxi.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/14164900304.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/zelixizekusijopewatuxipef.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/466a7313b1da24fd1a4e8422d686b97c/gukuna.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/tozoxadosejuno.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/99526245556.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/bawubilewalebupurevaxak.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/dovikag.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210917190641.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad2b18dfa8---gepuvokubid.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/674b24c0482c1d61add81bb20c545b9b/93791609512.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/80895089893.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161450cb34c44b---53548796996.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/bf36d479be3aa882218d091aba42f2da/69658601397.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/70876089403.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/seriposut.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/15466680175.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/54883949765.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/70808627793.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_off0000cc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9D 17776 bytes
SHA-256: 48a79e69e7804787dc83afa3b50a4f63ff61f7d4d5434f75bb8f3cdfcf989f9d
font_01_sfnt_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11341 9932 bytes
SHA-256: 8891dc21215cbac8011e24a0eaa2b4b3fe415fbc61ad220eb0251f7a0bb759a6

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