Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ce28b77f2c9e52…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 13:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3a6030072ca824be2340ed2dca73c444 SHA-1: 962af94ac0e2a019b4716d5d49814e711770a6d5 SHA-256: e7ce28b77f2c9e5279a3fa74d9654dcd756d29ddf107755f8ddd35bf7a794c9f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/5fef9d105d79a88bd3b288b31d341e78/61482615702.pdf In PDF document text
    • https://totounited.com/contents/files/wivafelapa.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/budotivuvipozoxibaxoje.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210909092740.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/kerisunonuxofonapuferasur.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613372c47b4a4---37245584639.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/kumolug.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/peradizolaz.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/21139986586.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/lazogosekuf.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fc513ae4b81d4c2a2354b065610c7888/65539847129.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/negipidemebemizatesi.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/susexefidurixupuku.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/71595226345.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210901_971C061AC63B223F.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/3836154f9dccefbd9beed409ad29886f/zamudosurimiwakosidiru.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109110502095363.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/11854211278.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/gevulisenepeja.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/71115675151.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f57fce5a2---jigewevup.pdfIn PDF document text
    • http://raczcsalad.hu/files/bikewagoboferugosixemag.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c822556cca---79404636469.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/nikubepinisowefiligofa.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/kifoxusajujuxawugab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sky+zoo+safariPDF 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_off0000d2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D2 10168 bytes
SHA-256: 5d11130d95f55f89914611d42f5462f3db43bae8e63041070299ab2e4113ab6f
font_01_sfnt_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 17560 bytes
SHA-256: bd3ebd343d84a7c66687766ad9c3f5d961e9c85ed1da68ad416f03623e88d36c
font_02_sfnt_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1