Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cfe442d35d8fbe…

MALICIOUS

PDF

99.9 KB Created: 2021-07-03 21:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 707fc48d9df630c72141987c22d1f1b2 SHA-1: 6312d286bbb26c226be8a6796a47cdd9d8c3a31f SHA-256: 82cfe442d35d8fbe0f9fad96f71c19d72fd8fdf1ad7df0c162351ceec75f3153
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The presence of a 'Payment redirection / bank-detail change lure' heuristic strongly suggests a phishing attempt. The document contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1c5eaac74cd93ba7c7245248b5914def/92769232530.pdf In PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c3165de5131---65365441668.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ihgk771s9op2cnlf44ur73k206/39886070139.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/59c46489239a2e7f3c581a4bd0f3d45d/tifiv.pdfIn PDF document text
    • http://toonesk.com/upload/43883320546.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8f129804a---93521049447.pdfIn PDF document text
    • http://matras-devison.com/upload/file/26145735234.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/19000021025.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/3c62390be37b6295f0ea6a3d6f3897d3/raserabapojidusufitadi.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/zunorawubovisaka.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/b51avm1nq253an1d4h7ncf73s1/bitenasozabuzadut.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083477b8b38b---43937557198.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/3b0614fc6ebf73d8fcc5cb08c69cafca/92029160730.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/takselo6m8i0f8qndbe7n4r3t0/31666111308.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/o6jesi1g9g4gi7gq4spa111ha5/71773470222.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/75aea5e41603348caf4a78b6a647a87a/xaweki.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2a3ecde4---35673411891.pdfIn PDF document text
    • https://aashianarealty.com/file/12103282852.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/67525104165.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfeda85fb6---64894801421.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a260d96f5---76707099958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=johnson%27s+dictionary+ielts+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 30828 bytes
SHA-256: d093be6a01b6bb739ce024486ac51f0469ca6be80b60d4c52ef8e534112c9bbe
font_02_sfnt_off00015f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F5F 1720 bytes
SHA-256: 0b613c231564cba6465e7d49f1b9cc61fd37c9c91bd907bb7cc9ff11f5ab39fe
font_03_sfnt_off00016788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16788 10692 bytes
SHA-256: cc991ce12942b15559d26561755452b9e6369cf83653e193ffb69f6654f5e063

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