Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4f3fe1f54eb5e6…

MALICIOUS

PDF

73.1 KB Created: 2021-09-07 03:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 09933c1431d9059e7c503383b14b1a57 SHA-1: 334eaaf32961f483a1090b3d17f24561c0fa3fe7 SHA-256: bf4f3fe1f54eb5e6d8adab07e31f24d839f7f7ea06232d17f8837897c5aa5074
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://a-kamen.com/userfiles/file/85670393251.pdf In PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d20ba10ae8c05a418aaed5733b2637f7/kopabit.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8226ea0b8---78000046644.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/61955273022.pdfIn PDF document text
    • http://lg-palette.com/upload/files/pepojukop.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/49156296841.pdfIn PDF document text
    • http://tayles.com/uploaded/21749323429.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/13185084476.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/upae404993fhec3v9f763il2qk/22130176159.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/52503172938.pdfIn PDF document text
    • http://espressoperfetto.nl/app/webroot/files/userfiles/files/11141336093.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/6666214407.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/71071946711.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/42595071105.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/17985554293.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9923af5a---gotumifafosuviwus.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/64868269423.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a07656c6ef4544ad2979aa6873817ec/mizapusulekefuxirev.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/kufotexafat.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/sh4l7elfb5a9uunjsnh31jgmfr/93836328669.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/42207670696.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16121748a0d7d7---32052797507.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52145297689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=superlative+exercises+worksheet+eslPDF 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_off0000bbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBB 16076 bytes
SHA-256: d8936a0c61980fd5fcfc13236d2e4a78137b6f1e2d38a8eddff0add2ff587a2e
font_01_sfnt_off0000e4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A0 10888 bytes
SHA-256: 73d3ab0033145ecea02235ea2e0f48cf3e4890c3033e178c68d624f5fd990ce8
font_02_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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