Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced65e10f727a0b1…

MALICIOUS

PDF

84.7 KB Created: 2021-09-22 22:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6cc0bd4a68b3c5d16d1be0199ddaba4d SHA-1: 362023d2d512c2735ad86e953ef04f8f1adb6fae SHA-256: ced65e10f727a0b19d8fbcb793c52165feed179f2db55ec68ba85b0b44b4e652
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The presence of embedded JavaScript and a high ML classifier score, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a malicious intent, likely phishing or malware delivery. The primary attack pattern involves luring users through a malicious attachment to a site that then redirects them further.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=how+to+create+shortcut+in+android+app PDF link annotation
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/42300705455.pdfIn PDF document text
    • http://www.520amis.com/upload/files/26193921403.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/44769977103.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/96541792596.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/00d6faadb39c8632d3ff76bf2c10dcc6/27338114475.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/54802148932.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/kujugokalaralijusaxux.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/51039371576.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1a7d1bbc1---93149907590.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/rosonojepifaf.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/wibepete.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/laxulaxexifanixurabof.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335fd8e76b3---webumozusovorute.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/20085948734.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/34503017356.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/bamijagan.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/fudeledo.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/24695134388.pdfIn PDF document text
    • https://equalland.com/uploads/File/51880560851.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/47845095794.pdfIn PDF document text
    • https://rintrans.com/files/vitetumamuzino.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/kejifidefafexigij.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_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 17288 bytes
SHA-256: c94871e41deac1529dcc994b6e1f576598ce53c64cac26dc4173e663001d0503
font_01_sfnt_off0001144f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C66 10740 bytes
SHA-256: 46766f6b52001d443e8b59eb7d7a990354c43e2d690810cd6d4ce77fa84dafbd

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