Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6902e76cb17edcb…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 02:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c05a54d01529af1fa7508e244587379 SHA-1: b3cb27c9eb9a1c352579da1c861a6551e9edc4a0 SHA-256: e6902e76cb17edcb3b6529c4a9aa4ee8a0257924d01469c2b51d1a75fab0db9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links, often associated with SEO poisoning or phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://scamps.biz/userfiles/file/wojefamutanaruxawu.pdf In PDF document text
    • https://lalicorne-hotel.com/userfiles/file/42223642369.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/pagato.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133376d57848---22648875054.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/dinanilupepulupejonosume.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/lawanib.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/vikowemefulavufimigelitik.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/sitajujaxaxexereze.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/56d03361d085b53cd97d194345bd7f4f/tivikaji.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/64003500594.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630859584.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/ragivofetimunawuvoweronu.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/2739573631.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/banifagefunazewamuk.pdfIn PDF document text
    • http://berbun.com/user_img/file/jetetakimumomotoveruvat.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/13711908432.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/12785983990.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/62469069823.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/kepifuf.pdfIn PDF document text
    • http://hrudolf.com/userfiles/nesijut.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/somejipunejekarexoz.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/429c60d4d3fe20f09e12f115f85d337e/68135764290.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/65823132400.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/16146397147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=excel+to+pdf+converter+free+download+for+windows+7PDF 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_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 10900 bytes
SHA-256: af75ffd978d31320b001bd2f5e55ccaf6ad0382da5376f45e7811e14a214cb12
font_01_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11185 17348 bytes
SHA-256: 192f912c8e0d09137a9e25994d8e928f3327ddc868d8089a9e83111ead957321

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