Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a189b84a8396b22…

MALICIOUS

PDF

72.1 KB Created: 2021-09-04 14:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9cf41d728d03027090ace656c8a68230 SHA-1: cb9dd9c8ce90006a027918e6ebffccb94b2a5af7 SHA-256: 3a189b84a8396b225dae24345c53c4b2c7839c5e4ef6b525491d8933d3b8d956
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ae3dd7fc98435144db19958f1204beb3/9623409762.pdf In PDF document text
    • http://jedwines.com/cmsCart//upload/file/57795129741.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/ragiboritowunukopik.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/vejobewulovifesoxel.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bufilewagajufazagi.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/22747020158.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078bb9beade2---monenunulozin.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cde29e79a5---65815763735.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/suridiluxutapaxo.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/44277385463.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/gufulu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a75d56c0b9---jomexeguserabivef.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/33449873573.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/vikuvopamad.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607406afe8692---19876679811.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/14490274996.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608467c4681ea---14337121546.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dc0fe083e---13891022995.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/59180858090.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3a9564f11---98344194243.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/67826012315.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/narigekovenibizogekewab.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090395b9a4ba---mizobitewutaga.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/bomezige.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/xukafizimidul.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623149664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=population+growth+biology+worksheet+answer+keyPDF 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_off0000bc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3F 11064 bytes
SHA-256: 1d41b190a35e2890bbef957551a5ddbe8536af1f5316979b70c751555fd12236
font_01_sfnt_off0000d5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DD 14372 bytes
SHA-256: 12e5dbb8ec39501795d1da05f107c0a6d1411408671e26f9cc8b6787ad158bc8
font_02_sfnt_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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