Malicious PDF — malware analysis report

Static analysis result for SHA-256 9838750bb4556ffd…

MALICIOUS

PDF

96.2 KB Created: 2021-09-05 04:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d01a567922c2f22ff31de7dbc833865 SHA-1: d9986aabaa9ec6a5686d361bfee84d6fb28768b2 SHA-256: 9838750bb4556ffda1c7085c544669aa0a50de2931cdd32c7501cf2118b7187c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://ltmetal.com/userfiles/files/83568964125.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8de5c466---mirawedafabibibadexode.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072b33fefb68---73679943343.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7684b01fb---94069590711.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/95512673109.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/6kd4opobb8e91gudhaomceuble/6336178772.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fc964e066652b15f4e53243f227d18d5/golitopexutufi.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/pujobegixunuvutiletukom.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/63749945093.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea586e4733---83306110303.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c90d745a3---77653335837.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/97306078434.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaac736a5f---povugorezo.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/63082877274.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/kegexonibit.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202108151628258662.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/55960058541.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e8714e038fd66622343ca0a4f45636ea/fogoga.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/julalejex.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075ae8a42939---24503624404.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/93538645759.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/58174356007.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/sekitofitiwavi.pdfIn PDF document text
    • http://masonhn.com/d/files/nogerupem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=warhammer+40k+8th+edition+chaos+daemons+codex+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 11436 bytes
SHA-256: 294056e1e97e532d39f9d8f643e637f170edcb47383974baeab550a94ff5b0c7
font_01_sfnt_off00010f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F70 17360 bytes
SHA-256: 17bd6d7cfd157e5c49e1120c07d2ea6cd7ab5cc317ce96010839b34f6f9bec1e
font_02_sfnt_off00013c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C42 18524 bytes
SHA-256: d110161de28c760d40c8a2a8e3a7798b9b24fd42d0aef9b464cdf8343277b67e
font_03_sfnt_off000159d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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