Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fc188e261810e7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 05:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1cfbc9f66b134f90eab4e2fc1d6ede0 SHA-1: 579f857097b815637a4315d95bfc32a5b02e582f SHA-256: d4fc188e261810e71f43bf6e6c87f8b5ce93b608bb3e4f6d1ee5fa20c3ef3b02
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns align with common tactics for distributing malicious content via seemingly innocuous documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://coretry.ru/uplcv?utm_term=light+speed+vpn+app PDF link annotation
    • http://kozszemle.hu/uploads/files/45712385091.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301254e8ff9---rinugufefofuno.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/31978842395.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/99595619580.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/rufovavexekitulitajezozir.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/12005623623.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/42568454042.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/fudogafebazuwuvifolifam.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/dazoruxasasodozimagoj.pdfIn PDF document text
    • https://2winit.com/Files/files/2747702398.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613101ad4921a---gobiwesefiginijoxamaf.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/78853422308.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/72813481844.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/62099636200.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/jipaxugagumaxawetulu.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39704687914.pdfIn PDF document text
    • http://popmetre.com/news/files/kitadimoluli.pdfIn PDF document text
    • http://davcpundri.com/css/file/96011270913.pdfIn PDF document text
    • http://asustainable.com/global/file/81972466746.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/27947997883.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/23930545479.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/salesugudowo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe89084ef5---19927133945.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/fixevomoworodejerikofofe.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c2061ae073ecad114ed772d456a08c50/rewudabo.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/24077261326.pdfIn PDF document text
    • http://palami.by/images/file/83522950613.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_off0000d4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B9 10428 bytes
SHA-256: c86b66036935ac74eb6cbf5f114f9280b68c4628ee8d98002b210562b8dbd602
font_01_sfnt_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 19072 bytes
SHA-256: d9478679e90dc479d62192aed3e03a29c901f87799674c2881ecaee385898cad
font_02_sfnt_off00011e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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