Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c90551286452a3a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 04:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8881559e750d2b841f66568f7d47f028 SHA-1: 54af3e697b1565ed01101a2783def0214d8f91be SHA-256: 6c90551286452a3ada7e356a0ff3799c78a211fcd7ad0f1bcf9f2950749c6d05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://oniceh.ru/uplcv?utm_term=how+to+dual+boot+android+and+windows+8 PDF link annotation
    • http://candemdientu.com/Images_upload/files/lawixizatodokosotedadu.pdfIn PDF document text
    • http://full814.com/upload/files/lowisoviwu.pdfIn PDF document text
    • http://starma.pl/files/file/86617170265.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/zunijojebirafejelataniraj.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614115c90d340---rarijegesanin.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/garafakixolamimefirono.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/95600704733.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kariledetanaxuvovinunufe.pdfIn PDF document text
    • https://matrixx.lu/images/lovopopupu.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/koralopuvupaperatazuno.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/xopivumovulariteken.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/bijusadekunu.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/duwibokojituzarotiwikewiw.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16132898f6da74---16632830710.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161334f7dc65ec---22457887002.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/36583182452.pdfIn PDF document text
    • http://makaroma.fr/upload/file/xuzobejoxewopokisufovo.pdfIn PDF document text
    • https://kimcert.org/E/file/nupepulifolizawozusojom.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/digulip.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/mitibelevemad.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55752bee6---89752951277.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae5823d2f---bifemawute.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/54412604831.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_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 10636 bytes
SHA-256: 673e5ee9e7067e765a88ddb33498ba4b17cee9421fd1a511274223d3de1a8737
font_01_sfnt_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 18456 bytes
SHA-256: fcfd2c7e96fee7086fcc2cec6ac15a262a30fce0e4e3c929de7aec537998c474
font_02_sfnt_off0001243d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.