Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09a4dc070179724…

MALICIOUS

PDF

70.3 KB Created: 2021-09-10 03:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6cc58380b75e9f269e11eb03ae2635ec SHA-1: 5ab7435752ca281a95abc495d867d99517051507 SHA-256: d09a4dc0701797242b526d92c33ad5895d5c4d71bc1838e67746e8f6422bbb18
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external hosting sites that serve further PDF files, indicating a link farm designed to distribute malware. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the links and the ML classifier output point towards a malicious intent to trick users into downloading and executing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kadh.kr/bobod/upload/file/pabagolugukulijefexemuxa.pdf In PDF document text
    • https://tempegaring.com/contents/files/22559483270.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/14407678473.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/xutinixede.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210902170731.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0f78de39---47702074857.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/75177766238.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210903_235235.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fb63a945---84801870342.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/fatabu.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210903093050.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/25291894462.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/movosasoda.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/repugaxujejalawolit.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/sokituwexopagamexupopi.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/34180643745.pdfIn PDF document text
    • http://canadanur.com/resimler/files/57949852766.pdfIn PDF document text
    • http://pasted-radio.de/web/files/rinitonaxulilos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a440e1a3c---mofelenepadibogemep.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/fozonuzubal.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/28949238317.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210902_1F6769F14CB648FC.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/fefosonewiwetumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=vavoo+pro+crack+androidPDF 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_off0000b461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB461 16060 bytes
SHA-256: 60f0849b37073be4019d71de7db155bcc6a7e8c5a2166a091cfaf4f3715d931a
font_01_sfnt_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 10188 bytes
SHA-256: e110889621e159a2514d169357376caaaa36abb782bfb1384da3f4ff3467b34c
font_02_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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