Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0de4039bf9041a…

MALICIOUS

PDF

104.1 KB Created: 2021-07-15 11:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b58608530192747164b9d9a9319a941d SHA-1: e8106764bd2b89a02d59a50d8334f3392388ae66 SHA-256: df0de4039bf9041a0c59b19e0e7e92284b0447f9f93a8d4100546b59f06c788a
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links pointing to various websites, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The document's structure and embedded URLs suggest it functions as a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/0ea8b85b00eb799f7aae6ed80242fddf/tisopakel.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/gokabasixupumerup.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743581a4cea---23161714305.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160914e0ee3d36---duzejatowem.pdf
    • https://mariellatriolo.it/public/file/28956597131.pdf
    • http://tpdw.pl/userfiles/file/62556918772.pdf
    • http://studiomilano.eu/userfiles/files/56075724327.pdf
    • http://abwcrainhwy.com/uploads/files/1979098388.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/8ccf5c8f0292ede5fa5e38bd6f2f9b2c/juvuwuf.pdf
    • http://bukvoznaika.ru/ckfinder/userfiles/files/86278626858.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c554ddaf8e6---keredebile.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8144b094c4e8cf240d5f7609e3a73f21/ganim.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/f5pvqsfa1b1dp6ggbjdnopnfdj/66656758278.pdf
    • http://dansecyr.ca/pdf/file/65505723175.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7d7cb9760---sararaf.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca14e5aa3a---97149029046.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/9f797021b4c5d7c821f9c801841ac7e4/lolagade.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d4f05de60---majawuvozotudajidelesalal.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/43g216nb6guudtqqi9lmmakq84/fokabitozivukeme.pdf
    • http://design-klasse.de/ckfinder/userfiles/files/wolabegitefo.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa03b00717---lovevasebagoginowawigo.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6bcf6ed25f719040557cb2ff08971083/79803912978.pdf
    • http://abwmechanicsville.com/uploads/files/furodozefedumib.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rq2uq0ac5fpj8msbpu9649d567/vusunafevejoxukagek.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=find+a+polynomial+given+zeros
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f16.bin
ef204a3cdf141d61b33b71c03d0e4796034417107abd3b10e192f43e8a104036
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F16 18724 bytes
font_01_sfnt_off000160ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x160BA 16792 bytes
font_02_sfnt_off000178d1.bin
a5ae9bbfe4ec930549882230116a21675254c903bb2b75a410a82be924c28b78
pdf-font-stream PDF embedded font (sfnt) at offset 0x178D1 10856 bytes