Malicious PDF — malware analysis report

Static analysis result for SHA-256 126b5ef52ff200b9…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 06:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ead69fa07e5c858cad5f0f28078a70dd SHA-1: a7628283417b655272a19f1776d56843c840e3f6 SHA-256: 126b5ef52ff200b95dd783275a7257d8c8e1848896f24987bcd375cfcdb68ed4
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The presence of numerous URLs, many hosted on compromised CMS platforms, strongly suggests an intent to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=percentage+change+math+worksheets PDF link annotation
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/rafuvodew.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a326b1a990---22669039605.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcfcd24b8---34488374936.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/71159465807.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8902d93d1---35221031860.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/58818286140.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021061920500596.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/sefexa.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210718185800_g2p586.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210718100107506.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161353eea10fc7---detixan.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/mutezawodakun.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/lowupoku.pdfIn PDF document text
    • http://prestopc.it/upload/file/nagefo.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/wuxabeguvorugofi.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/68680584715.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/jegevunegoniwifurumiwez.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/nameresigiloxogemofij.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/7c68159f9d8195dad49a201b50345ef4/tabazegupulave.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160933a7186d3c---zogemogudafedinifavov.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb3555993e7---desovavagovemux.pdfIn PDF document text
    • http://fotossc.pl/_files/file/76112174068.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/21bbfef650797c1e11adb970943a2a6b/3714598950.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/93764196387.pdfIn PDF document text
    • 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_off0000d5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FB 10720 bytes
SHA-256: b361aa3632e70553ea311ac070dce683735e62d850498f6079f8c015f4494dad
font_01_sfnt_off0000ee8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 19092 bytes
SHA-256: c260341afd90bc9396387e88096094627536ecc137d2cbe54fa5263df38b4e20

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