Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d249e79efbdc34…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 00:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b26af5cf9d9a33bddf19b6f1804f7662 SHA-1: c9a60857f8ebe3fa6a776dbb10ac07b8f03d25a0 SHA-256: e5d249e79efbdc340dc2998350f2cb56c302c7ac4d206d1adbe58cc6885025e5
196 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document attempts social engineering by prompting the user to install a browser extension or update. Numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish for credentials. The document's structure and embedded artifacts do not contain executable scripts, but the overall pattern points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pixomot.ru/uplcv?utm_term=how+to+convert+web+page+into+pdf+in+chrome PDF link annotation
    • http://timandlor.com/userfiles/file/saviruwefavepijomefotog.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/tefefexixepuguwopomuj.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/jufikakorep.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/42c43ae75b02588ee7c5b99b5e5f70d2/87746868275.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/divudotemomuderuwojukune.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/ragigegovured.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16616ad86---7468969234.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/83728429062.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/numoka.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/dexenasibedepidowitu.pdfIn PDF document text
    • https://digireg.dk/upload/79620243445.pdfIn PDF document text
    • http://gardatrans.com/content/Files/84983325339.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1h342kj5l4nv58skmo31bfh0s2/41094564566.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/26521473674.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/voxajolifazedome.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/35259970049.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/70979623786.pdfIn PDF document text
    • https://deepex.hu/hirek/files/57196125000.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/12345049189.pdfIn PDF document text
    • https://mavibusiness.it/file/94208625080.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/92746703629.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613a22675479f---3958576655.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/dokiwunuvawekeludu.pdfIn PDF document text
    • http://ipceurope.be/assets/file/28443584744.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/96161712499.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/42316971570.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f4c17d2a976c316e2f0dfa0ae633a087/goralanafogu.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_off0000ddcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 11136 bytes
SHA-256: 5ab80e9c40e13e7006762c47f98d6dcd977ee79d60c22480e09f29d9771c78f8
font_01_sfnt_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 17784 bytes
SHA-256: b48674f1b50a53af095c900f37bf599ba72b24509d891d09f0aef6196d20169e
font_02_sfnt_off00012571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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