Malicious PDF — malware analysis report

Static analysis result for SHA-256 44354fc5c2b77629…

MALICIOUS

PDF

101.8 KB Created: 2021-06-28 18:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bbbdd4043127fa9fbb513de7b930faba SHA-1: 05492dad58580c751af57b8574ced80b4c8cd311 SHA-256: 44354fc5c2b77629347013b11873f92ecdc98e50fca8448fb8b951bd0b150c4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO manipulation attempt. No scripts were extracted, but the overall structure and URL distribution indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 https://smidgel.ru/uplcv?utm_term=assassin%27s+creed+valhalla+oswald PDF link annotation
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s8titjufq01asp67bcb8ke8j56/xokuvuwiguwa.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/patepiloguwetoxujizetan.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/iea3sj7abm0cgfs0vu5u290bjf/38615481806.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/66912256805.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/wulobemu.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210621141752_9w18pw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608be2a352225---newiliw.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fee85c47e292adc40a5d4a7d8c8c7ec4/61945341429.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98ff65b2e---winigegegokanejopaduv.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/marafupirake.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/99682858278.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b29da5d39fb---bepopotumak.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d40d3018---66271989822.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/puzubakererujew.pdfIn PDF document text
    • https://stopserv.ru/files/file/ligififu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/759c1f682542f0b419211492c70b26f6/zozavipujedeguzasa.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/7c9g7sld4f1nm5phe1iiulutt4/puwajififeva.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a30712985---nawiruzasavefe.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/tegenosufifupajun.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff3fb492f---wokaku.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/14qiaj1gi836e9t4ik00s8nls5/sulomudam.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/vapogutakigazog.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082610befad9---vuvubusadibija.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/xenudikizezekaxele.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 17932 bytes
SHA-256: 2a99ab842365f2136fff1f4df04fe9273f1b5048f77e5b6f50da6558ab051ab8
font_01_sfnt_off000143a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A2 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_02_sfnt_off0001591b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1591B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17132 10536 bytes
SHA-256: f6e1fbf4f35bfc18ca4804ffbe26232a637b01cc86b38ed83d281137731a5bdf

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