Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c30825fe761ca7…

MALICIOUS

PDF

81.4 KB Created: 2021-08-08 12:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d9d10f3b7d6214e80c5c235651c68528 SHA-1: 7c4ac77bb1ee9455e641bca2eae7341c99015553 SHA-256: 71c30825fe761ca70572e5440bdc4b1eb59203c76e67aa3ec11c78b245555531
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It functions as a link farm, containing numerous external URIs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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=livre+recette+tajine+tefal+electrique PDF link annotation
    • http://luingpyrex.cz/foto/Image/file/gilakogofapo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814d27af04f---lirokirezerabiri.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/40551021188.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f58124b75387fc3bc64444bd498170a3/87560593730.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/42717980437.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099be7aebdf7---98027388814.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/1ca77ea3057da1f785f1e4a4808ae0ac/66058752120.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/xagasuvugitelivekubi.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e6e24863---gupomorosijuxojo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4533a5e57b---luzunaxobonegoruzumezinun.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/kagozitoresasalasedok.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/05f4d8756080f2d4a8068ea9061cab37/zisoxetuvanubutu.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/34825877774.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/3c2695ede13173ae8cc23f482d8f5352/52499267472.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b75c1813285---89827451591.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/acd8744f43759e440a9552cb00e68c65/getapulawum.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/35743e4dfb293b4837d191d376625f8d/waxaze.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/60343367705.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tolatuxef.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/d3h3fv8a3hdec3k3dhrrrc8v03/72566399253.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835f47b1235---pakejitazunisasizigox.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730f7ea678f---vipusegezaligu.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/bexogidibokerefapiragedi.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6758500532---pawumerugav.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd66d0d399d---67216654042.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_off0000d8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 17384 bytes
SHA-256: 4f24cef5b8500869aa5c64f06c66117ecbe6793862c523aef4d18d5384d5a7df
font_02_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 10440 bytes
SHA-256: 686256ee9986b978ee8e19449bda79c81eb9946cac01eac8b900efc5f6eb18d5