Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7712ffc11153bd…

MALICIOUS

PDF

75.0 KB Created: 2021-09-10 08:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1f258caf4547c69b934b2e27a51d463 SHA-1: 72cd1b5d1abc98e6a71703e0ac5123665b993ba6 SHA-256: fd7712ffc11153bdaff6dd6f696b76816972d9355d97bce3352467525b6866a6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics further supports the nature of the document as a gateway to other resources.

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 http://galeriejacqueselbaz.com/userfiles/file/maxaxemuzipetupuj.pdf In PDF document text
    • http://ace-pharm.com/upload/files/17912415227.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/35261580059.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/67887253942.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/61630542871.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/82817779802.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/gapexiziwew.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/jojuzexudano.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/depawixob.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/18833333686.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/sesofalujavopunonuxukota.pdfIn PDF document text
    • http://195exim.com/datas/files/65126754599.pdfIn PDF document text
    • http://hijoin.hu/editor_up/fixetekabu.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/xabami.pdfIn PDF document text
    • https://x-software.cz/data/file/muriduke.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/98519145549.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/68890138958.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613102f953da5---94740834943.pdfIn PDF document text
    • http://rc-modeller.se/images/file///bidubom.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/9415a87b8918bc646ca12632e0569674/suwak.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/79795004983.pdfIn PDF document text
    • http://kasargod.net/uploads/file/33314980340.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210903_154820.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0554f368---jitiguboveripuketuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=montblanc+ff+tacticsPDF 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_off0000bf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1B 18852 bytes
SHA-256: 5f8669f86a9980f8628f18b2e0652fd385e2bb04b76a9ffffe2647d7e8354c42
font_01_sfnt_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 10228 bytes
SHA-256: 6575956d48f2beabd334f9faa50c7d66af76690adc5e447199da9947f8f7f151
font_02_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1