Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7e78ca08b83a42…

MALICIOUS

PDF

72.3 KB Created: 2021-09-24 08:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4a47ad334d4ce1ea0a40e9972176738 SHA-1: 2845e3cc1b57f42cd6e5c0e4393b35293107b6a3 SHA-256: 6a7e78ca08b83a42da520c7d9b44ddef746806c65fc2dff1a70bbf2ee463de20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links and the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=editor+de+partituras+para+tablet+android PDF link annotation
    • https://augsburger-dartliga.de/uploads/file/93578495962.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/06aefb688bcfd2c85b7502b350e579a3/92787491031.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/94249726498.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/9076265107.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/goxiva.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/26346979107.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/sovufesetedo.pdfIn PDF document text
    • https://equalland.com/uploads/File/soxofalubawu.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/vivawewosubulitivuw.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/rijupovupujodoku.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/bumagimugolati.pdfIn PDF document text
    • http://gibisch.biz/files/files/gatifo.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/6716962387.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/40369716234.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a40dea1796---ranavirulup.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/83253618589.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5e7e768ba---voredetenazuzorogib.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b9d11f934---66891559150.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/nolafomitatozazevab.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355a9d3d154---52828251822.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142426a139eb---samolepam.pdfIn PDF document text
    • http://potya.com/66181561506.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/75839414728.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_off0000b943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB943 16740 bytes
SHA-256: 210a2375be3e501bb663536482cd9a0906583ec9733416d9480ed7bdc85cdcea
font_01_sfnt_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 10608 bytes
SHA-256: ef08d7ecb84e09057b4294487a2e9443b9ddd84b5da3b3f5c6d410e46b887cc3

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