Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f99342f62483d8…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 02:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 24c270832a0f6b068814eb1fe48f1a7e SHA-1: 3194ba0ff9cd159534d4aa4280d52a7d9ef11310 SHA-256: f8f99342f62483d831bbd007e21fa05700496123e8c6d9c914d30760ef5ec66c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used to distribute malware or conduct phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely as a spearphishing attachment.

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 https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160807d4364fa9---bunisusinopagenijitapizi.pdf In PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c63f2494aa---wurewur.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/82254367069.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/p2nrlpae99e9e39khl5dfl0366/jegabinemugorotuxi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbd0bd1c40---denamibagavo.pdfIn PDF document text
    • http://vhktn.at/images/content/files/9680973585.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ac102c8a3945ee6a3ac40432a632eea1/wepusosawenaxoseve.pdfIn PDF document text
    • http://topas.lt/userfiles/file/domal.pdfIn PDF document text
    • http://clingac.es/d/files/16633918618.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210604123841548.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/93105825690.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608a793d87388---27194002195.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/29784760020.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/80232089468.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/29457587774.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/gafoti.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab12d3305---tegufutilodaz.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/51765884398.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/46450039669.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ovkj3c6661ocvcid8icl0sau9t/62014432482.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c42d9bc8197---zubuxotemunepifat.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/74706130183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=stem+worksheets+for+6th+gradePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 10980 bytes
SHA-256: 951a7cf8fbd9496458b6fca4763b17c36a843cfbb73ad1775bb0e55a9415b6b6
font_01_sfnt_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 17028 bytes
SHA-256: 8e29f2fac379d87ba8fc4b2a1b850e87ccf91fecf6e18e977076b587b3a0fefd
font_02_sfnt_off00011ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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