Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43032b7504c814b…

MALICIOUS

PDF

75.8 KB Created: 2021-08-17 21:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 77ba6740519caad94a9db9d8d18767f6 SHA-1: f8cb68a84bf1e16ad6417b79dc14eb03ed333df2 SHA-256: d43032b7504c814b707b04a160c23a101ca69474f62fef636caf6d0c91571c7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of these links, combined with the PDF structure, indicates an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted from this sample.

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://nomylo.ru/uplcv?utm_term=chadta+suraj+dheere+dheere+song+download PDF link annotation
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/64df4a32edf1e502d86456f9e8fde00c/67622769315.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/08800f5060cee90ece7226ae22b66644/letubimusaxojo.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113190fdce7d---zopum.pdfIn PDF document text
    • http://allycatering.com/userfiles/37179734490.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/27761039133.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/lukesirawa.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4943d110f---netemuwona.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/radamemiru.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/37926760606.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/99cb7c6c7ff33a70df7156f5aa89f4e4/91570767341.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/e6rdrafp7h4irijdfkc91osq0t/58040859874.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/56260706427.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ctgoj53hca0bakrhdftmstg178/datufo.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888e25d0e76---23987888719.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/40670116006.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfa4a04d9eaae27ca27d6eaa2d5998e3/puxefajazajesufig.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/desexi.pdfIn PDF document text
    • http://kleiberit.ru/files/file/93116135968.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b905a122efb---4289932950.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/xediwo.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/felafiwovaroniralaperoxa.pdfIn PDF document text
    • http://marymo.ru/uploads/files/13135176372.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/188u3rrpus8uerl9f05chtjkn1/10176778996.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/qvjfr31lpbr39qv5n8ta939a95/54871925356.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_off0000c1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 10780 bytes
SHA-256: f8ff3827b2aab70f74f742b0e16ebe8dc29a76d6b77d1c5103ae65ce04e81563
font_02_sfnt_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 17076 bytes
SHA-256: 6c3efd02f858f8ca4c286802c493c7d14d9435a6b9d947b85286944c751040a8

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