Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5862722d5cc4c73…

MALICIOUS

PDF

97.9 KB Created: 2021-07-10 07:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7071b2c427231cf348f31be09f93789c SHA-1: 0f407b2830761aea623f6377fd662a5a3da8e8c3 SHA-256: f5862722d5cc4c731b27f2fdc6e44039d95d1c01ff3bdac2a139d036071a0f63
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this document is part of a link farm designed to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://mikomisushiwc.com/uploads/files/60540286226.pdf In PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/38677459074.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a7124943f---riwonexunadajivaz.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/4974982436.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/f151bi9pvvr5mn5oaodosrbg93/38398065775.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/dexusisigojubupaziwo.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/17617298906.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40b6fb1a97---fasese.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608d51d7f25b8---6257045637.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/sosazelukexuvujuwo.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/075885605d73b92422a26c7c8104fea7/74018006055.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6c93589cb3b1bfd6d36c34bb1fc40d6e/91726159928.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/fd2820f706cd225ab27f35dfb0205fa4/60044706842.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8d077377dee66408c3a49b581cf16761/78301666856.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ehaakpaunqlm33q68smb2psdeq/47648246726.pdfIn PDF document text
    • http://maihome.hu/admin1/file/96118983571.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/kizow.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/97550668713.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/lotakusakevaxade.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8289d30fc93278eece8f90d6e6c823ac/wogixozopelonunupuki.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f432854491---vogoverujirez.pdfIn PDF document text
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/lusebefebudiloxenijo.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/63903542636.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b234da400c8---30097277617.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160aa93d5a0963---wegewag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=student+exploration+seed+germination+gizmo+answer+key+pdfPDF 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_off0001150c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150C 20012 bytes
SHA-256: 3d494d7e4481f3e890611c2608663a24f27f486be641a602be332b2d12ad3aa5
font_01_sfnt_off000146e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E3 11468 bytes
SHA-256: 79d52694c1ca142ce990d5a366aa87c9b569e0df6648cbd438104be960267083
font_02_sfnt_off000161ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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