Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e21c6f985a43dbf…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 05:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87c377813302b0458cb6a94582fdad97 SHA-1: 9b905be033efd421d7673413d75665272febadd6 SHA-256: 3e21c6f985a43dbf98a1286ed1d21ae6026cd29471149d626527751e3c7cd818
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the document functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs, such as 'https://drafthe.ru/uplcv?utm_term=tamil+online+movie+2016', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=tamil+online+movie+2016 PDF link annotation
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c8757fab862791ee70d25431995f9ecd/molij.pdfIn PDF document text
    • http://reylab.com/userfiles/file/renuk.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/95421270614.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/37137446769.pdfIn PDF document text
    • https://isleo.com/i_photos/file/63398234996.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/57152204639.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/fokamudifijejifofik.pdfIn PDF document text
    • http://ave-france.com/pics/files/kuvesufebezilolaxako.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f67d94e8b3---kifokadugovorazibozekapum.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/47844887420.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/44831887297.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/84743476524.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e38a6752e---915949745.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/ferukija.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/13/55636290913.pdfIn PDF document text
    • http://iltorg.ru/upload/file/98870661753.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/misilijutafewijawedena.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/32713021001.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/6972375325.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/kenulasezuji.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/tupizesudoziximizapamu.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_off0000d5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 17424 bytes
SHA-256: 316aaf7942e624d39145eee7d69c8976b7c9b1d47fc984156876f0523b8e547c
font_02_sfnt_off00011ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB1 10392 bytes
SHA-256: 73ba3ed80cc28908c0d907a68cdbb0f3530ce19d6d0f4da14676ef197af76296