Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b882d0281cd712f…

MALICIOUS

PDF

96.0 KB Created: 2021-08-10 02:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24189b94f3ace7bdce7508f601022dd2 SHA-1: ef795ac2909258b89bb607a51fbcf88e570e92e7 SHA-256: 0b882d0281cd712f7781b27ca484dda57d37f1b9a21073ed1b603114e1cb2ae1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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=business+proposal+pitch+powerpoint+template+free+download PDF link annotation
    • http://gopherandsquirrelcontrol.com/admin/images/file/meresaxafifazorodotel.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26195880f2.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210807202915.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/bowonubepuremafadava.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb6f60fe30---tojuk.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/3808128391.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160881d2e641e0---jizexedotafenelekuf.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/xifixuletogafifokojem.pdfIn PDF document text
    • https://proxus.nl/file/90513478837.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/11495104636.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/pj82a1qgfog01n02a6f5itbmj7/36794293179.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/rokofufonoxuwikakumo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4480b0594f9902e6b6dc21a73ad2040d/gibimisefawad.pdfIn PDF document text
    • https://hoalavender.net/upload/files/selofi.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/34852740918.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/60517332464.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/zixinove.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079480412061---60211879159.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/72fbfc67fa2814590f5b3b303e5caee9/82430041270.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/45488340671.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/34191891715.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/60569561390.pdfIn PDF document text
    • https://maisonforville.be/documents/file/95407870707.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_off000113ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 16740 bytes
SHA-256: df0b3c7ee4766e1d6e0a99765b1456fd11cd05644adc819a13914cd019ed54ee
font_01_sfnt_off00013f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F64 11124 bytes
SHA-256: e06a4528966551755b30f61a441ac16ed45d658aceb18882748f414d83635e91
font_02_sfnt_off0001593e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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