Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02d29b9091db01d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-09 05:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bf8975563720f332132bd2cf4e3b890d SHA-1: 1462f67308e86f8bab8a83d61571bd0a4d1b1592 SHA-256: a02d29b9091db01d3da4c25932d1b0a4c9e4c7266877e3f4e65f50ed43e8c71c
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 websites or disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pasarangroup1.com/contents/files/vaxekedapubodajanaf.pdf In PDF document text
    • https://www.xyoaa.org/sites/default/files/files/46493075403.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/volazoj.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/80421639571.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/topaxuwomadubofesagitoxil.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/54541680620.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903103048.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/47332102a30367fa603e40e2db64cb16/xijogiwulowager.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/danizu.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/58381787391.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/wutirekadawiwunonozuxow.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/dinuvixobaxige.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/gapazetavugezinesoz.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f9fd4f461---xigewunon.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/zasupetuforixufetiga.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/49802167291.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/69622592016.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/bkjk7u7o75e3kalnl3eijhen0t/vamodojadig.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161344ba5a7236---76405983939.pdfIn PDF document text
    • https://fishboat.hr/files/60396293249.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131c529ab09b---67071139807.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/zopepilevolariritumo.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/dunuzusozusatagumuperoto.pdfIn PDF document text
    • http://dhf-china.com/d/files/24377151143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+android+weather+app+widgetPDF 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_off0000d31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 10764 bytes
SHA-256: 364def2358e69a2f6617eb676b35c143e9eb0de49152e03f6c93c154e9bd0beb
font_01_sfnt_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 16664 bytes
SHA-256: 4de163cca9beb4a69c44cfc93bcfd2d5116cb8557cf6605b1856edda5d960ad4
font_02_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1