Malicious PDF — malware analysis report

Static analysis result for SHA-256 604007165d78b595…

MALICIOUS

PDF

86.3 KB Created: 2021-09-11 13:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8fee6729525fa51f125ce62854d08d76 SHA-1: 846f7fd1794a7b6b1e90028c4b0e08d009bce6b8 SHA-256: 604007165d78b5959c566ded671e3735b21ccd0ecbbf9eb50835072d5a462913
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to distribute malware. The 'SE_DOWNLOAD_BUTTON' heuristic and the ClamAV detection ('Pdf.Phishing.Trojan') strongly indicate a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the URLs and the ML classification suggest the PDF is designed to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://catamma.ru/uplcv?utm_term=convert+epub+acsm+to+pdf PDF link annotation
    • http://3bbb.fr/ckeditor/upload/files/towowufojozimofowijijaxe.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/nilefadizetiwupegobomez.pdfIn PDF document text
    • http://bulmarconsult.com/files/11376492606.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/45686471392.pdfIn PDF document text
    • https://akemi.ro/hirek/file/72563068410.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/95600704733.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/002f5c1e10a53dbc48ce5259a6f1467c/68783095842.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/roduvebod.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/82798277418.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/17205345593.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/tababudugajododibesu.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/nexosorudoj.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/tevumaf.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/86600426107.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/171034769.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebbc5af7c---15655205726.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6627402b---44853890128.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/womurazojuta.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8f9a2939ef8bf6344ec87fb7ec05e545/19936202736.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/zilofafidifutaroxatev.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/kituxudokugur.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/46d2447cd31ff160397bdf0f018daf4c/debiwepazukewebuwiwofaloz.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613958b089ae5---tawonobopukafifafun.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/68094807049.pdfIn PDF document text
    • http://12shio5.com/contents/files/mutoxetisiluj.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_off0000ec37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 10980 bytes
SHA-256: 85def3c63d13a935c9c25fd5168910f41721a7b09280c8efb9b8c67bf62c8123
font_01_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 17840 bytes
SHA-256: 3f7144c8ada0ee1343b48c62be9fb02c7de9ac5d74a170fd25524823a9131c19
font_02_sfnt_off00013361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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