Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09b65d0343f12cb…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 19:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 669c5ba9af83ac4561ad6b0f35868d95 SHA-1: c687fd2987e098e93fe06233066b7bfe4489cae2 SHA-256: c09b65d0343f12cbad7c74749d3ecde8146a7292d826370f229c52dad785c163
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wieswioska.pl/userfiles/file/gugusununovalirax.pdf In PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/dusasew.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/fawaxitepawivawixurodiwux.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161506a88df25d---59188590327.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nvbecrb1i11mjdrqmjg24luio6/70317689871.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/26812281203.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/sejipoxapoteranabubosa.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/visasamujoz.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/99069006732.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/41380914271.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161443ed579038---tulafam.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/wolugujivumot.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/tolijisixivo.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/mamidu.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/sulilokofobirupukomotagol.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/bomixu.pdfIn PDF document text
    • https://mattress-leader.com/media/29652520186.pdfIn PDF document text
    • https://ptogel2.com/contents/files/toxupetalujapuwejanem.pdfIn PDF document text
    • http://a-pluset.com/userfiles/40589390692.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/5747081306.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/nusodonafaperok.pdfIn PDF document text
    • https://sinarwaja.com/account/files/31691863326.pdfIn PDF document text
    • https://xlquality.com/userfiles/file/93373170398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=from+ios+to+androidPDF 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_off0000b1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E6 10208 bytes
SHA-256: 61bc0e44aed8e46ded2e4a3b290b933789727ad65c83c7f4199bd3e509738bb5
font_01_sfnt_off0000c8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 15220 bytes
SHA-256: 19c4431833576ff74c927b07b7640b14f450723e3cb7a4eb57f32982b58e8469

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