Malicious PDF — malware analysis report

Static analysis result for SHA-256 be62b0c24ae24d5d…

MALICIOUS

PDF

68.0 KB Created: 2021-09-20 02:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6361c16d7d8ae02070ffa5cd49cbabd SHA-1: bb1ef8e286ed84c54742050b8cdb6b0bfd3ac3a1 SHA-256: be62b0c24ae24d5de7ebb25b78fdbbe70771ebc02fd5ff9912a1715872079114
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://fotofidelity.cz/userfiles/file/meputugakiwaloniworuto.pdf In PDF document text
    • http://nensi.si/upload/file/49964862490.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/89612528616.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161380bccd7c77---leronidagida.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/xogideduvasupebe.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/fipimisofuzepavum.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135303a466ba---zevofavorojebiferaxujab.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/dozedipakakigedujovudo.pdfIn PDF document text
    • http://learningkey.org/userfiles/xavaxumegamun.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/sejuvevixowozupabanuwi.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/gufanikifonasivosexif.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/90274600212.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ffd9b6e13e46ce2878e4b249705d1031/xadim.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/mufefejuxavigimorepax.pdfIn PDF document text
    • http://julianina.de/upload/file/pagujage.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/xemarubazanegigafijupir.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/figedipobuga.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631846966.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/rikewepaxejitatanozet.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/44564274210.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/5021765849.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/wedawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pes+2016+file+download+for+androidPDF 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_off0000adc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D7 14308 bytes
SHA-256: 4ad2592ce6f9d4e3d66fc873a106dc6ed0ed60d3bb4375d9f14de6f9c042c99f
font_02_sfnt_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 10800 bytes
SHA-256: 911e4bb91c6b6fa3d5644a6f7c05286c34d3bac9253e014395a5625cb8bc8e6d