Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e9b09ab58fb56f4…

MALICIOUS

PDF

96.4 KB Created: 2021-07-15 09:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a3952712507a3ece9362f534e1ae9eb SHA-1: c6d09d7bd6bd4085c224626cca71fa5ca10a5501 SHA-256: 2e9b09ab58fb56f403bb705ec229de1c7700f239c804d5361c6389f24d59da2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. This suggests the PDF is designed to act as a link farm, potentially leading users to malicious content or phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://uleshuzataruhaz.hu/files/file/lutogu.pdf In PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/525b7f78b1d397ec2a284bacc5d7efc9/93133953328.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a06ef863353---maxakanaxus.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083bd89ad430---4674261936.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/79d11625cfe5eba6ec69994d857a1c54/logovowep.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5kupljrhbj17pmsme9hlmk1lqq/28600829922.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/86230575690.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/tazinedokilowo.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8b65b0a9---pebebuzeta.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/fucc14u6b6huqaj5onvnc047n7/fizafefajisizidunomeja.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/24185915498.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/99395192091.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca5d673275---82398870483.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/vokivoruguwavafama.pdfIn PDF document text
    • http://kd-council.com/upfile/files/zokarabalubi.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/50449084063.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/862aa652d5dde6bc4e96b106ce5c4b93/wexigib.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/21679160263.pdfIn PDF document text
    • http://18554080.com/userfiles/file/bilubuwowifetofu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c70237dce0536944da700f8889a70217/lalamaluvamawama.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10c22e143a---gaparebepawidireko.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5a35e189ab7a1e59aff4696f4fee3767/35089354288.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b075890e0d2cc3dca0662fdc1530f88c/wixubisinal.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/marofavetijesed.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/af5a4b4fba2a4ef6e7451d9da0112440/fuzotidobifiwab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=action+comedy+tagalog+full+moviesPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000105c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x105C3 18768 bytes
SHA-256: bd331050ec0a7e98648e4adb5905163850a5a8d72fccd7c501a3990939b93ab2
font_00_sfnt_off0000c97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97B 24900 bytes
SHA-256: 8c8a84e4400afb36b897e4b38108f14189d19a674882ea9e2a5c18afdeaea91f
font_02_sfnt_off0001242d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242D 10980 bytes
SHA-256: 9d127b79c723e626256efb5ec643e8c2680cc1398dd91d8cc5d50f1ed90ffea8
font_03_sfnt_off00013d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7F 9808 bytes
SHA-256: 1c41a7ea30b870d65c805e4e023977978dd998025f5b4ccf071e686624c4118a
font_04_sfnt_off00015d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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