Malicious PDF — malware analysis report

Static analysis result for SHA-256 906d00dd1f1cbf77…

MALICIOUS

PDF

92.2 KB Created: 2021-07-20 17:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1808167b7c23f294333f9fc728d1f88 SHA-1: 75a3608d142fbe9e6740fcbe474d0a03e95b02ae SHA-256: 906d00dd1f1cbf77df2ef69fe701d6e3a24885d0b8a2664aaf1a35f3beb0a51e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the nature of the embedded links and the PDF structure align with common techniques for luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b0b82aaed83f1ab581a51550ee10767/saguzivawaxuwubejevorosaf.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae18d5606---85310416070.pdf
    • https://kodcomputers.ro/2664/uploads/74129623219.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/stmms4h1fl8stfcmibn6vvhun7/14073485374.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/2bdh8orhofh0pajt5cglbbs3hv/pedosopaxuxoj.pdf
    • https://scalper.ir/data/files/file/xevubesujuxeruromis.pdf
    • http://bindashnews.com/userfiles/file/32284049666.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160f0ecd606054---84922448709.pdf
    • https://itacademyindia.com/ckfinder/userfiles/files/samixukabu.pdf
    • http://www.thaiboat.net/image/upload/File/19141479629.pdf
    • http://adamlegal.com/userfiles/file/43331744576.pdf
    • https://tecnicadovolante.com/images/file/pofegevatifobujoxezisike.pdf
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/21465011195.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4d33b9b0b---dabonepagizu.pdf
    • http://jpind.pl/userfiles/file/sovalezazajaxetige.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/ribenubosejajupozeromifu.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c07f0097a20---rakazamivuralawaviwup.pdf
    • http://czdashan.cn/uploadfile/file/2021061918595173499.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e152215a89f68c80edc7509ea344f0d8/gisona.pdf
    • https://vayamcs.com/content_files/files/30516901158.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e03b294e976---80096233905.pdf
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/90422248775.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/69eb020f80d731a2123765b07671bd0a/50264426320.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/0efe0e6e76786e0e2617ee8e72ce9ab2/55808649463.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a4b7667834d---waxaregobefutopi.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087f66d90da2---60770656953.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=countries+of+south+america+with+capital
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105a2.bin
8f0d5486df8cc9a85acc68298baf267e96c33a9b715386daf9c2857f2f9ab2d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 10960 bytes
font_01_sfnt_off00011efd.bin
3b0b8f9c8c439536a4add5b902b890c07bb231c5c8d5d1ef4f92f1bc4bb71980		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 17172 bytes
font_02_sfnt_off00014b3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3F 16792 bytes

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