Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c8920e51ea4937…

MALICIOUS

PDF

105.9 KB Created: 2021-06-14 20:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9614fd9b3c71ff292d5bc5d1c3ab0f92 SHA-1: 2b8724a8561c176dfefc488d31a8b3fe55be29d8 SHA-256: c8c8920e51ea49376aa0f5cc8152be9d9c893f0c11d1b3903e5127bb29227289
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document likely intended to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pixomot.ru/uplcv?utm_term=12+feet+deep+full+movie+2017+english PDF link annotation
    • https://netshopnepal.com/userfiles/file/23260476477.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210525125735_122898142.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/6391879ada6c05b46fb5479b79f0f051/48263115072.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/932c4c06f635ef5c42480eb0dee5f76e/54298893035.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/0787bfb657fe7876eb9d47a3e822f284/napofekeposumi.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/teluzoli.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/remitalasilanesuxadoja.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/70909b26d00442643045e75ed27c25f6/zepeginigojozepefezigopo.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/36096905879.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df26235fbb---75370480554.pdfIn PDF document text
    • http://feast.to/upd_file/wemox.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743f3f0dd9a---51191998810.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a5836f16e---20661181800.pdfIn PDF document text
    • http://gyobel.itpublic/file/fosabuneline.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840f834496b---zakivefadilijowasi.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/zejinijesimovefizowo.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/69512482747.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016ee3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16EE3 24332 bytes
SHA-256: d889ae222b029cbbf621c09d28a405ac50e7a8c5a7cbc63e18234a94a8c3edeb
font_00_sfnt_off0001347f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347F 5520 bytes
SHA-256: 479a2698756b292e7ecf23ffbbeb6af04dfd60d1d755247cf3e383dec239b800
font_01_sfnt_off00014741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14741 11564 bytes
SHA-256: 543c3f39fcc73daddb215ff1f5162a41887c25b8724b205d437681f6d71b4754