Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef402d0690ca9af…

MALICIOUS

PDF

83.3 KB Created: 2021-09-10 00:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e197043f24151a9fff3f35685be36067 SHA-1: 3f8d65dee590ac3df7dc214d0f17f7134dbea52e SHA-256: 5ef402d0690ca9af007748f395c0cf42eed1b467a61b2f95b7559c1e99533c35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and unreadable, providing no clear user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://parlagame.net/calisma2/files/uploads/bigesizusexaj.pdf In PDF document text
    • http://saltokisport.com/uploads/files/fanunewoxawoboxefojumasaw.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/90431066684.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/37070259889.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161360f16b0a6d---potipedupivojofedunexix.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/527b5c178b807b21ff2f1f5de51f0c88/raberogejoloxenumupo.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/xexuweb.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/zuvovigijowowesedop.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/tiruzamomiminivu.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/36342135982.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/kapupivakezufaboz.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367df7aaa38---muratadipijivopokegoxape.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161397edb51528---tagolarovunalelala.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/306009598e12110d42d7f830e1a05944/mibunomemibupofezajiru.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/zidaditeramopofeka.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/gepabun.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/fijasa.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/fabikumafuvipev.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/vojaxibamalawirubivel.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/zaxagotakijuzixifafizorus.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/mifawubalotebigenujopubu.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372413227bd---xaviluzo.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/42497777694.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/1728292328.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/73550945902.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/lilikigutajuwutifupinajez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=poco+x3+gt+vs+redmi+note+10+proPDF 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_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 19308 bytes
SHA-256: 5710220c96bd6d791976cd0b4f96902bc3a4e37a2d2711ccceaf3cef4700d928
font_01_sfnt_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DD 11164 bytes
SHA-256: ffece22160e672f4c4cffd7c45676b5cca0b0f306280d749676a57a37f13b5a5

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