Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e732a247e359247…

MALICIOUS

PDF

91.6 KB Created: 2021-08-15 01:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e93576de0c38c34a8f2d321a0a22a061 SHA-1: c9c94932f700cf9a227a786f225ded34899942d7 SHA-256: 3e732a247e359247e15910860ebd9666bad2975a2980ec8f4e81ef1d2acf54c3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to distribute malicious content through a network of seemingly unrelated websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://heldermusic.nl/ckfinder/userfiles/files/puzopikujafodimivu.pdf In PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-22/20210522210218193908.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/pakufosurepuxugofeb.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/14f3091789ec724d2bef3aede6c3a840/63308518429.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/t84bifb2qgv05sbhikfau2utao/85886166743.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/pefutera.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c5ue04c4v2581ohdsvqev02lfc/wiredemifomidufin.pdfIn PDF document text
    • https://dcimx.com/files/35457156012.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8eb33ab7a5fa87896860bb8f17adcfd4/vofodajetosiroz.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb4a6c749---95204851536.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/18119602709.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/14706735364.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/89011582453.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/legoxijolidasevo.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a98310ca---86608032954.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5376d4ffa---44215754019.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/rovipevubav.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/58303029926.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/74653223583.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/92541821480.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/saxubojedilizituzojesu.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/52f3371d20d4546adb0651b48cf0e0ba/xaliruge.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e783c9dca3af229bf5dbb6d3c53a1bd6/nujivob.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/iuj3enakhvinflf1mcd43f2dgc/texudisukoro.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/gikijija.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a949013361b51d4324273d53f8c9a9c1/wozuxipizuginajoredevur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bridesmaids+diarrhea+scenePDF 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_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 10424 bytes
SHA-256: 77e2df9e32a2873d5b7a5df80ec28a0033feacbd472cf156f2e415ebacd97101
font_01_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 17568 bytes
SHA-256: df1360cfcaa935b187892a17b2c9552b855ec83eeb8a39658051b77ddbf561f5
font_02_sfnt_off0001480c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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