Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a1b9f442f24954…

MALICIOUS

PDF

98.7 KB Created: 2021-09-04 09:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6867df3083a1438a720ffa6e7f020f51 SHA-1: 2fc2f8a54c12902ba9f83d231900672641a8075e SHA-256: a1a1b9f442f24954e99b2a24e25eb18e2de0a3d41a09f91422b1a5b58ca5ed87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs point to a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9700

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.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3laki62cdjphq14mtiat820gf4/75798981054.pdf In PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161296080afbc4---52295738087.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfbc5666fa---refozozutovani.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/32790437129.pdfIn PDF document text
    • https://agatanorek.com/files/file/gimozos.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/mobunosipipevuranipedipa.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/51ohjujmrub9lbcndaqv6ka031/62564933149.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/zagosom.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/buxefubokaladofoda.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/k7rj3ga1d14vs1cv0c9kvb0a21/duvaguduvuxoseg.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7174cdbfb---42170797520.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b47cc3a21bcd1c727ac3baf86560bb6d/jebojezenizi.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a8acbf4f2fc3082b74fc56115195a9e3/vekulemabagexejuliraj.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/basiriwoxutitukujopa.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/36899362091.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/6ad744ec81e5f14d183d38149ac82ec2/wukumesobadetukiwinomij.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff341202380---gesukalexoguxudol.pdfIn PDF document text
    • https://successalpha.team/upload/files/wuduruzisojoluligasaxu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/62c4c7f0daed8e62e230708090adf8ce/juposotozubelivajuka.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/muvaxiwizus.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/zunob.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/mizil.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/40367578183.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/rapodujapufifaximudujamep.pdfIn PDF document text
    • http://alkanboya.com/files/file///zejir.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d903dc43743---rojopenoden.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=alfabeto+griego+mayusculas+y+minusculas+pdfPDF 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_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_01_sfnt_off00010c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C81 11296 bytes
SHA-256: 4009bcd2c3782053dcfa398f9be6ad51947a7322b2046517d84edbe469d4162b
font_02_sfnt_off000126b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC5 24444 bytes
SHA-256: 65cad995045841790c2bd512e7aff86a3e4baa93e957ae4bce004ca7291c5c63

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