Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2d433f0230fec0…

MALICIOUS

PDF

77.0 KB Created: 2021-09-01 10:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d2c58cfe18e5a740331bef109fd3b1f SHA-1: a1792386883bfb95f7aa0a19eb7189586271cb18 SHA-256: dc2d433f0230fec0749ce11e000870c8b1dcda54fef1f74b133050ad235aab45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The PDF structure itself appears to be a link farm, designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://pixomot.ru/uplcv?utm_term=buster+posey+kristen+posey PDF link annotation
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/fa587d949559a2a0c87d8340eb46d450/2599337764.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/vutav.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/4580694348.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/29081631332.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/lanikisi.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/83636491977.pdfIn PDF document text
    • https://lasanisports.com/files/diwojajixox.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/navojanopamelunowul.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c443365c4be---42044308637.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16224076803213.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/zifujivotiputo.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/aij78afekj17i3t72ru8glej0r/39952573161.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/xofefapolexonusizunesine.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/84167573144.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/3a757562f422515ace8130e3b1dffce2/1213685286.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/69a4c68870c995b13769430323e3278b/rosenenezuk.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fd879e9f---4104510787.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/76272404729.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/lidusamokixilutufuvi.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/77a57e68e2df4d916fae50ad7ab9318a/27308768910.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8503b054e---25378000741.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c51428ec342---gewafo.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_off0000c821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC821 10396 bytes
SHA-256: 0a608a7c9170a8a4ecb29dff8917e1fd6c19285fac0c8ccf68d82e6dcf547741
font_01_sfnt_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 17872 bytes
SHA-256: f62891872d6863825df70619f9bcabb44407bb74d5b68fade8a0fab3da722e85

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