Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ada3f64c093990…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 09:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0385da13e3f89038d0ad1a10349ceb99 SHA-1: cda42b5bfc0f4533d9905ead5f8af447098a451a SHA-256: e7ada3f64c0939907764a008d61fd8534dbdcef0e82b343d47bc1d2035155c77
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially disposable hosting, which is a common tactic for phishing or distributing further malware. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/5854355392.pdf In PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/kulowu.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/libabakiniremilisisowewuv.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/fsvh94hhdvo9flef74o95odpe5/vejavoramulaviwometejin.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/69970752765.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/42334115243.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/70964090398.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/11762482345.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c000647227---45891109743.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/71010287161.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/musezakasulixi.pdfIn PDF document text
    • http://emannsltd.com/userfiles/99941814007.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/ribodigumijed.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/kqohpnt39ofs8sv30lpr4spmhn/79062656338.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210912_6FEA1FD364C815F4.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/lakatit.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/nosilepefal.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/jiwilegamujunu.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/rolanixofif.pdfIn macro / runtime command snippet
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/l08u7hth8uiqkb6rgnap43vi35/93586665292.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/47267224928.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/st2v0eedd6f2p5r2eclpl74d8c/juwinobiponebivunepu.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/52623814392.pdfIn PDF document text
    • https://skywaynepal.comIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=on+screen+power+button+androidPDF 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_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6B 20216 bytes
SHA-256: e5aec84d21afbaaa9e49ef3df89b1853241fd7303945848679a563ca77930b98
font_02_sfnt_off000133f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F5 10812 bytes
SHA-256: 56f23b14783b39ebd4f63ca138f0a39aa5a6675c2b42d0e576a74cd738122eda

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