Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa8ddea216b887f…

MALICIOUS

PDF

115.7 KB Created: 2021-07-07 23:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 67dffd31fbe855ba354984ce46fad77b SHA-1: db28e1b7c51c43cffe2a40d29a759f179456b471 SHA-256: 9fa8ddea216b887f32e3c92bb2e42853d373f07818737ae09bb5239a76a500fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the document as a link farm designed for SEO manipulation or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/e4kbbqhl13vvkm9q79dlcnk6nh/28255378124.pdf In PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608174b9107e0---lukugegonopidikirumu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a18d51056791a487574057d2e94a3891/bitutimulusemorixibonexaz.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608459a9079c7---72581028878.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/87588920459.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/j0b1bovla8p91seci7iekfs0tg/tilafaduvusinokezupupi.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/tukusoriwalofunij.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/dinavazawaziveraxeridu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/42e7fac4a97f5cf10d75607a14fa4c68/riramafab.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/ca8f034b0c48f62525c200c90bea62ee/vomarivagekifiri.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/42471500409.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/nidimexufigikof.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f554f2a9---kinolobuduxakobusew.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/nifebe.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0eb265a23665a8c5f468c33cd5432728/seloretirolulubawuxuwu.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/9u9pjnmofptv3svtp29oumq73r/piwemodekede.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/gamowutikexika.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/48840758185.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/20aa45ef787cee555ca39ee1eb5a9e54/54767821332.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607480db14b9b---53489653052.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8208032210.pdfIn PDF document text
    • https://patc.fr/imagesfile/kojoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=assassins+creed+bloodlines+gameplayPDF 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_off00015f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F9F 18044 bytes
SHA-256: 4914ec3e04302a81ba4b6fe248d2abd999fabe1fc477cdf07540a46289f4ce6c
font_01_sfnt_off00018ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6E0 10996 bytes
SHA-256: decaaace8be5cf0ecbe928ab1c02789130fe93ffc5793e211dbcd7ceb1614eb1

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