Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ce9b39db3c72c5…

MALICIOUS

PDF

72.8 KB Created: 2021-09-12 11:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3d90eb3bf186e09c9e02e93c587a941 SHA-1: 81c44628c9d3158759d45349b58ac9d97044807a SHA-256: 71ce9b39db3c72c54540286e923a15400979284e7d94e40f448cd3aba1622bb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to direct users to malicious content. No scripts were extracted, and the document body was unreadable, but the presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac6f2011c---48596108029.pdf In PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/kivilavufegosilotinur.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/81959612657.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109052129304991.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/vawulodobegipib.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-05-21-21-17-93.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7f0eb872d---negototebojoxofubage.pdfIn PDF document text
    • http://i-dron.cz/data/file/fegalezibojujananiwoxemob.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/602f86113aff8cb7214e5f19c840e58c/39560388521.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/72a06fd3f47f7b0d540134217a7cd2a7/fagixazevorep.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4dd914bfc24b3fd4ba28e033c037afc8/rodukinuwedivebikilivurij.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/wesirirokusakologaf.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/93045738810.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/5324933874.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/nonewobumoxoxaguwa.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/66a487ac5e610fe26255462621e5f245/wudebazasonuzu.pdfIn PDF document text
    • https://synersys.fr/contenu/file/52006028933.pdfIn PDF document text
    • https://cubic.is/userfiles/file/50984771528.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/5876876258.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/86994567246.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/tejoxudo.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/jokeweloko.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/28555706644.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/rokifirakuruvasokujo.pdfIn PDF document text
    • http://pronobile.de/catalog/file/xoluvimepuwawevomode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sum+of+taylor+series+calculatorPDF 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_off0000b892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB892 16860 bytes
SHA-256: 4553ead46bec7a139fee90e9b9bb19580594314eeda7244a92f32b0348202417
font_01_sfnt_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 10684 bytes
SHA-256: 23e1a5584f01e44c596ee4a9f057c0145020eb41f1528ed22e9eb80c284d6145

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