Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea1b719c140fe3d…

MALICIOUS

PDF

90.6 KB Created: 2021-07-22 21:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7306bbcc9cbbd630d2c59593d8300f02 SHA-1: 297be479db020100855236b0a4164f088a7a79ab SHA-256: dea1b719c140fe3d50f2d7a271f328c80ac5ed2b01f6ff6fab334d4cb02c2878
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/cs72dj6h1pl7735id3bl0bikiq/folewopamomaxo.pdf In PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/liwurigatorus.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/medeziragolurepaj.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/jowom.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aee86d900ca---gebagakomogefusef.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1be0d3a2a2---95088058494.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/wibamulikaxufiketegu.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/98706208120.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c696005fc17---349497050.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34b69f9e5---51112094989.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/34068237299.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c35344da7b---60434837341.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/59eob9p6cdep05sfba6hcd6v5c/gixagetizar.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/30lagcm1kn9rhr92klnn6gie8s/20189760064.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/92854892191.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768fa1e2caa---34959107814.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/zaxosubiritatekexiwaxapoj.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/xefefuwomerujuwulaxi.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/32714807524.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/63930501392.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/56181128000.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f557edd918---nodemosakumo.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/34129212224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=today+daily+spins+coin+masterPDF 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_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 17820 bytes
SHA-256: 7de5b9dd0f1c28edd793b0a2ca811e10c8beb28ff5c9157353b1449f70605f64
font_01_sfnt_off00012b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B32 10752 bytes
SHA-256: 8d5336c26501093cf0c4eac97a7bd544303ce983296d8de241dfb3d86c783f2a
font_02_sfnt_off000143ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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