Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e5d9db0b1dbe77…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 03:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7818b669704c1f20c2b09e91c53387d5 SHA-1: b8e011e1a2e29ab895d54ac6757c0dc56375539e SHA-256: e8e5d9db0b1dbe77f58496bc8c822dcde1f23cc624f636b3fcaa36a63fa76e2e
156 Risk Score

Malware Insights

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

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, pointing to multiple compromised WordPress sites hosting PDF files. These links likely serve as a lure to trick users into downloading further malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/jn9k20u9gtbe0149bvv64vlh88/69689094545.pdf In PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/25393881571.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/94b847afa4cb4f00dc752c5635897b11/moxewerina.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/bofadudevoza.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/kijusejomiwotepujoduzajoj.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/kufulefesejubopum.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/bunafixe.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/51092400192.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/26444535661.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/tem73nqou757r2v97sv6fjk4ls/57889685646.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/kepikujewilomobu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/09784fe952fd85a2eda466d076869bef/29475474078.pdfIn PDF document text
    • http://wajl.net/img/file/2021723123051.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/09o0b974jcbsamigncius645sr/66054935050.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/pd6jqvpbvrn26kobbkmeeeicc1/vavitunuvowuwonuwi.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f076993ac9c---nokobunevafaxikofidamab.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/95494368926.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4802d2b6f---45461014405.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97bc2f9a5---15160736821.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/deresik.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094fed30c1c8---litivagawonugarala.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/68214356953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ditch+witch+trencher+operators+manualPDF 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_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 15952 bytes
SHA-256: 51c12fb1f6799432af68fb57dd9718a07817ceb3c0bdabb5b270a5e15451aba2
font_01_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 10828 bytes
SHA-256: 7b374e5b2d948b2b278b1e08708d7689f52f49d6d2e7313ff17d14dff9d1043f
font_02_sfnt_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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