Malicious PDF — malware analysis report

Static analysis result for SHA-256 11dae1e6a05d48bc…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 08:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ba6fb1d20dae770b6151a27fdab071f SHA-1: fe99d207d4bf9970be410d700e492ff615e488fa SHA-256: 11dae1e6a05d48bc88e0ec361b8f93dc745d5e55894c1277d394f46bd4bdb4e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure, likely leveraging embedded JavaScript for execution.

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 http://shosholoza.de/file/69890265928.pdf In PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607f62f88294e---susobozajawuvoxodu.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/6187635242.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/1481854430.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/bodivagajadumepovola.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c43a18c907596e9f2ffd7b254b766962/razivawoji.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/vilukenugot.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8648d10bc---pisolugumurobewukebe.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/58711997232.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210827_EC95A8B5ADDBA320.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ab5d7a977---98843975887.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/kner5loilfe102h20hrh2tstls/23517686272.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a77858c10ed---vunoruxosatufato.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b96068a96ae---90069253913.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/25902159151.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/30528975136.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/28269781259.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/vamuduzedejekorevowos.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/gapowopagiwegodogofusitum.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dfc540929---totadidopuxixalidezosos.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070e14205634---21298967652.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/tafepewiwajuzisetav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=app+that+answers+questionsPDF 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_off0000e1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 18444 bytes
SHA-256: 284cbf59dbb5e18721e24570c27a258578149416b2da7ae9bff7549b9b822ccc
font_01_sfnt_off000111b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C9 10616 bytes
SHA-256: b984ea9fcd354472390505510b6451c420a2446155e9209c39bb0983d361eddf

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