Malicious PDF — malware analysis report

Static analysis result for SHA-256 70833720530d211c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 01:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c287d5fa4d23855fb60fae7f5504439 SHA-1: a582cb4ca952f7b3ddefa078aa291a3e3347467a SHA-256: 70833720530d211c238cbb416181076777140d8d4d9af2c9e1f615c0717abeae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=prepositions+of+time+place+and+movement+worksheets PDF link annotation
    • http://botosani.ro/img/uploads/file/fatapazezezujexopazufimi.pdfIn PDF document text
    • https://tmtteks.com/files/1037117340.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/5157176f191f38b0fe50315017b3f01b/vuwaxeka.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/55814833713.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63fe70758---3973217178.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c74f0de23e21a0a814ec95976787b7ba/91311412853.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ac4901fbc---77815361452.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/15edfae30f718d3bbc0c3747f9b9fad8/45747332188.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7k8otsh4hoqq9mqipot7ce7ur2/47248580211.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/72871088520.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2f33e179f---45163331090.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/nazexegijaxogitasaji.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/wovemivofakesusavuwosed.pdfIn PDF document text
    • http://siembra.me/uploads/files/81487454778.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/fonovolowi.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/luvitezulopo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/26067195966.pdfIn PDF document text
    • https://subarini.ro/mm/file/79998235088.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/89887401995.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/tadazejikuxirojowonike.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/k2lc83tg0ui3f28b7k227ae2b9/lewekodikawakufefenagage.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/57102982877.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/9u05mok7p5onpouj9hturdjpe8/nerovikipixa.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/81mnpic5lgd95ec1e24sj3vit6/83561718338.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/47d5f836779b2473cc6942f3a303c27d/dewabesafufekujopibisi.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_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 18088 bytes
SHA-256: 759585dd44a18939d91d52eac12b9040bdac93e8c237f6e136ac579feccb5ce4
font_01_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 11128 bytes
SHA-256: 82ffebd31c00b32fef23f0bc9b9d5121f6d68e1b89652037c5bef34589cd4274
font_02_sfnt_off00012314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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