Malicious PDF — malware analysis report

Static analysis result for SHA-256 788280567e7be59a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-28 00:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4b16c93a7a5f14052a6e0a54b5c4f5c SHA-1: 617963935617c523c3c2a5bd5c94c795b630534a SHA-256: 788280567e7be59a7fb63be750e5c1bbce9fc72332dd2e419c9b891b0fb91e68
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with numerous URLs pointing to external resources, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dagmare.de/userfiles/file/wuginadenadom.pdf In PDF document text
    • http://thietbiotovn.com/Images_upload/files/35606570796.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/lusonopubarubazelidafima.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/92005871001.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210928020308_blnxh6.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f052387c48f768294d6105830237ac35/gesijimivirogun.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/fupipagusi.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613672218e3b5---kigelusepisux.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/mimaronatajuviz.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/14368947985.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/77945378407.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1539046143613d58f8a1553.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/87288118770.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/pikodejum.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0525pcd2vm97vc9777ensjc3uh/gafesozijixumewuv.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/kefogulomugas.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/powoxomimozazotunumogus.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///28665519885.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/zolepalo.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/60369624300.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/kasodezupizofazifijemipi.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/jezivatutogetumufuw.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/75917495655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=top+war+battle+game+basePDF 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_off0000b3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC6 16976 bytes
SHA-256: 68d33c07e3dfb32f78a1cf9670b7b8c58fa38c31955e0eea763b6fff4822a705
font_02_sfnt_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 10588 bytes
SHA-256: d18b8e9c667c22e72cc476306b1bef66bf2aa4b8578a50e51e11c8742a24d0bc