Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3df15b67d7e0b23…

MALICIOUS

PDF

95.0 KB Created: 2021-08-22 02:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d166f36f3c2b2f483423370fa5735fd SHA-1: f38402b8fea38a56aad5e20a41c6e242757efc0a SHA-256: a3df15b67d7e0b23b08163404f535fba4e98563e1f778345cff5e942e41743f4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d663467e---bulag.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610459409b588---bixagof.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/968842906d80caad2a5c38ff7483ac1b/72730583003.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/vukowoserujek.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/64604251063.pdfIn PDF document text
    • https://beaszemin.com/files/41598534565.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/be465e478e0c97c7bb62af8b21798364/vilatapiwumebunukatuj.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/fevedopaxejoranul.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/4277522513.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/47565851594.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607af698518a5---835100858.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/levumemavero.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac7fe3fc8---79119933624.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/59356606360.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b6288e903---buwoletodumu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/kenejamorisewipol.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/radawesebanevovitadawudir.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/98595826242.pdfIn PDF document text
    • http://tfforming.ru/d/files/23724411955.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/1e2de406d7ab62f3d85326a60130b0ef/53607530104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=hotels+near+me+with+pool+insidePDF link annotation
    • 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_off00010f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6F 17764 bytes
SHA-256: bc6e45727e69c30b4a9bc3b1e665fc7d3d66621cf2cebd08d90c0c1198e0eef5
font_01_sfnt_off00013d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15567 10732 bytes
SHA-256: 96d0c8bd64682a91a437d469bac3722488bc5e5f682da7416f94256e0be76b6c