Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d0d18352fc6e66…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 04:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eed7c24bfe736802139a6e7d9ecd1f43 SHA-1: 1d03ab4feb2d69d4495b12872b436f6381b7aa88 SHA-256: 86d0d18352fc6e666d060ae15e81dffb06f0ca2aec5cc2f571ecb7bbe3ea1ba8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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.pepinieres-gey.fr/ckfinder/userfiles/files/buvorabafijuxajari.pdf In PDF document text
    • http://xboxheerlen.nl/userfiles/file/63979033792.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c60b884ec8f---lanimudojupuzazamilor.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/71063756598.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/91846fa5d911cb6b70a76119426bd9bf/10844464785.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/29989546822.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/10161678692.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/9560363891.pdfIn PDF document text
    • https://mauspro.net/upload/files/49654956140.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/sajajirewakufu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0352f13cb---92884504564.pdfIn PDF document text
    • http://screen.by/images/file/gugupameko.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e7ca7078b---3093990020.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/74210904974.pdfIn PDF document text
    • http://coumert.com/images/file/nevesetigiki.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/migiwujesefaresepaw.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/gaxodabowe.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210714125811661.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/25990824130.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/20748366827.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/46036393282.pdfIn PDF document text
    • http://walker-doss.com/clients/4/45/450b4a4af5ff3f13851793278d9c7ef8/File/ponivuloforokotosukutif.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/22906236788.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ce68b2139ca144716e9c995acc670bc6/42089836482.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef907aa5c---jukinovok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+sacred+templePDF 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_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 10428 bytes
SHA-256: b4f0235974dd623fb0e2946a4ec870e616c2427b16c40bae4a3f708e9de49813
font_02_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 18288 bytes
SHA-256: 722b6f2c2beee04d93f5e60cd84e653d764d5cde3937c1f8bd9b048394e41a95