Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf789c718c3735f7…

MALICIOUS

PDF

83.2 KB Created: 2021-06-28 02:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b80faf7e49dc050d5b775ecfdaf486b8 SHA-1: 9fc96ad301ace043f7412a41913d25fe59a174bc SHA-256: cf789c718c3735f7473ee3ca9be1eca00ee62a5c2b1a4601516a047c471155d5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides a password to decrypt a subsequent archive, a common tactic to evade gateway scanning. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=how+to+plant+seeds+in+minecraft+education+edition PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/f4pl02een0gjk8f3e305bladdk/66598913971.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162301389356.pdfIn PDF document text
    • https://jetaime-shop.com/files/25725758735.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f3ad18bb3---26083109721.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/1342263068.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210528001455.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/vv67s6no4gc4e0euh0u073esv5/vixutapowelizorupovul.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/venugododo.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/paxudiweretadulolewugedi.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/3854871388.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4fffeef074b80a90394eec70d049dea5/kutepefo.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b314a8d22---79954533134.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jomjgho34vptfo3sk5t6seek9c/gaxar.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd1a8335ed---75833194538.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/74f5aeca07f51aa758ac6b7bbb0078cf/wenubazojir.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/57744297405.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608199e3960c7---wogojubagu.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098c19743951---2624875628.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/23431274250.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 17996 bytes
SHA-256: da61aa0a0356f53f5bdc92635fe651a8fa3b5769ef5ada79b147c18bfc43a11f
font_01_sfnt_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 10956 bytes
SHA-256: 255222a7a4505cdf2d15b8bf551e82f07dae7c9251ff51486aa8b6cadcab714a

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