Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2ea78f41a5f76e…

MALICIOUS

PDF

78.6 KB Created: 2021-09-14 13:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6715422681a52f3b06f69f994c0e13c8 SHA-1: 8e51b2b710eaa6be6973227073fc456f22c1501b SHA-256: 4a2ea78f41a5f76ee353ae6a722085c17a651543ee7baa98960e8f30d701517a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it may leverage embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pvvc.cz/files/97212980130.pdf In PDF document text
    • https://hoangnhataudio.vn/media/files/56646022244.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/75108397574.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/jataruj.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/bupufolubigejagaxizobubel.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/64724217105.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/tonalozuvuvevitukulolenam.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/xapasasor.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/bivimeredomowovibisome.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/75722644742.pdfIn PDF document text
    • https://bunianco.com/other_files/File/ripokofivo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/798b629f11fce5dad37286145cd83d68/palogisemesegu.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/kuvujaxepifexifim.pdfIn PDF document text
    • https://riwg.in/userfiles/file/44402960461.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/zowatofad.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/bovalesigilux.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/kirexomax.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/14591180140.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/loripixejudasosazumubur.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1d8605b7c---fevogunolipejevep.pdfPDF link annotation
    • http://myrbacken.se/login/ckfinder/userfiles/files/dixubutizimu.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/6512024235.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/zenosawodezazowusak.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/95222333791.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/piwegupudigeb.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d69026855---gupovabunik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+backup+sd+card+on+phonePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/33e9c12760417b5ff7ad46fd82b9df0b/garokewidizikunefisaxufa.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_off0000cff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF4 16876 bytes
SHA-256: 07217f415b0fb7904c8b159b86b8a056d59b298740657436fb243a1f29f767ef
font_01_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 10884 bytes
SHA-256: 38b58d63f0c9a2ba702020706864f3c1b73617ef0026f063439b2b5f37dcdaa4

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