Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfe7d82d85d9715…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 07:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 145709914e2ad2bb239875b7d07afbc6 SHA-1: 985f99a28f2aec693316b65a2e1fdf93e0846e08 SHA-256: 8dfe7d82d85d9715903856e8e99552dab634eee5a89eb4a00dfdbe5510e6556f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to external sites, some hosted on compromised CMS platforms. The document body is unreadable binary data, suggesting the primary function is to host these links rather than present user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://studiomalpocher.it/userfiles/files/kejifelemixududodeke.pdf In PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d0142765263b2c2ac4866d9a64c5e3ce/taxefik.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/59257181367.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/o3q3b7emr4tn1i7hhh8cc60gob/61796545448.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/62926212301.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/59010n0o3053bahcuikiggeeue/98427929189.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c35a9caceb13c4804d255123cbd6bff9/janilivitilotenaxuse.pdfIn PDF document text
    • http://kasargod.net/uploads/file/84765248488.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/pupitob.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/3f5949c43d205785f53a78d8744f5392/63822724799.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/2m898nd7r2eod2vjokjedql876/turop.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///daxajiduzixitemixaz.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/v55ic5qhqkh1g0trul90uvoud0/butaputeliretilov.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/31154655934.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/qs0dadm6hu7knqq977qessqnet/dilotomugikapiduborutu.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/89e6bb18878c04cf6c1a477b18ad4c91/38704477031.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f26b6bb71332f87f9853d0d2f85dfd98/6863196975.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec43976f0d9---gajonanipepusipebabexud.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/99053162102.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/jowefuwidoxokemizasi.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/44e588b937ed86d12baced897df2cc00/bivozafexusujexutus.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5712758968.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/pizaz.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/88796356671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+determine+if+a+function+is+odd+even+or+neitherPDF 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_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 17808 bytes
SHA-256: 9697cb2b3ffe43bac85b1d79a36d93f9dc27a476daeffc66d39fe2d2b8442d2a
font_02_sfnt_off000123fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FE 10936 bytes
SHA-256: ca6567e746e08f292f8c537e23f33780bf327638ac09a6097bf5aebb44f5401d

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