Malicious PDF — malware analysis report

Static analysis result for SHA-256 d409724c54fdb5cc…

MALICIOUS

PDF

75.4 KB Created: 2021-09-20 15:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a5e1fa268e34da931ae60983680d49e5 SHA-1: 98f035e6fdbd66299dfabd23c13dbc2823ec4958 SHA-256: d409724c54fdb5cc7c8c19ed7fb492e532717afbf5d3bd69a5c2495d939d2201
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=world+war+3+android PDF link annotation
    • http://rebeccafantarchitetto.it/userfiles/files/70268466041.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/98671716058.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344529133e9---45928314117.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140a186d9de9---tasipupodekibabonowe.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/58365773780.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210909195311.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/96319212533.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/53980308151.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/nisulowip.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/36403390214.pdfIn PDF document text
    • http://usmleworkout.com/files/file/28906199744.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/73502700741.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/57112193829.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/zasitoxemu.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/zudodi.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/84518215371.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kotepulinaxujupoboje.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/78000518145.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/34474089180.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2372a0bd3292b06d48159af6be9989ed/xibex.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/tubuzakirolakesaregetub.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/mebekabifotadikuxeleneb.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/sapifilenixuteveverevumo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161362a85b03f2---25243278133.pdfIn PDF document text
    • https://clickbox.ro/images/file/81838153419.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_off0000c604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE16 16736 bytes
SHA-256: b9e9be76d0df7b9c2212123850fefec504e01af5a466967be196e2944bce3198
font_02_sfnt_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 10096 bytes
SHA-256: 7f8ec69bc589d6b6b0f939a4d3a33b57251d4343b51c80b6b98b7fa9983d7152

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