Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ac3a11c7444a86…

MALICIOUS

PDF

77.8 KB Created: 2021-09-27 05:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f241efff509c5004af49cf818e5ad1dc SHA-1: 730fab387bfa419d0fd0cad5ba45e24dcdb60419 SHA-256: 01ac3a11c7444a86a87021512139e4ec6fcac700f8c75f4d76b029400684fc01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and disposable hosting, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://queure.ru/uplcv?utm_term=convert+excel+to+pdf+offline+free PDF link annotation
    • http://dreamsurgerycn.com/ckupload/files/mifoxozorukinakazujajuze.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/pijobumijeruneta.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/586355667.pdfIn PDF document text
    • http://live-net.it/file/rorozo.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/40280249823.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/nagomaxijogazu.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/18883607896.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e0be24c4dc881726d738dc58a056def9/35557434760.pdfIn PDF document text
    • http://tlcjty.cn/userfiles/aa/file///41534631665.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/mutenigajazazezelasexaset.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/84452876507.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16150eb4ed9e09---sivakonajazatamij.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/73542837549.pdfIn PDF document text
    • http://benly-carson.com/product/files/sogibekit.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/78505455504.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/bubuti.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/16508949122.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/bunomapolalokipisexu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d346b0ee6---batixoga.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/07666c8cffd9c58ac5ebd87bd23b95e7/86676966609.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/97436841921.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/32232003834.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/vuvapor.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/29062071236.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/48953703139.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/14456912258.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_off0000c739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC739 19336 bytes
SHA-256: 2b7f3bdb2c1794fa637d3c391c7d77791c4815b1a624bee51c858e402d1b95f5
font_01_sfnt_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 10484 bytes
SHA-256: 3ef474a299cce44ee8888ec029a0a200a4376070ba285a0a70d745320c8b663f
font_02_sfnt_off0001113c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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