Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7eabb56eac53cbb…

MALICIOUS

PDF

73.7 KB Created: 2021-08-12 21:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a9f4d34cf50b8391f95f883cb8a649e6 SHA-1: 442b42b2022373039093814e81d962e909fd81df SHA-256: b7eabb56eac53cbb0add87a9c3443d0bf42a5c850495cbe0ab427a350ce1496c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b47a92b9a4---zekezenebewujib.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d592b00b427---samisavapasemofokivux.pdfIn PDF document text
    • https://fasaac.org/temp//files/totowuna.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/91907064983.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/6a23e46c525ff63bd1a3e31398f1d9f7/jazizenekevadidegaz.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44193736ec---81494974232.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/xavatevegemeziginaxosiv.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///41400904741.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/10803073533.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b092082c779.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/30433728663.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b7e9a062f2e047527ff4b8881ad34167/35310391768.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/62301693425.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/jipasulopimasajoxofamu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1194e8fa---87450275031.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/7073843729.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/71659646606.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/45918734210.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd3408435a---94501978583.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/83260378967.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/47472173886.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/vajitufujoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=hotel+morrison+114+bogota+direccionPDF link annotation
    • https://lapdonline.org/file/17539801534.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_off0000bd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD75 16596 bytes
SHA-256: 9a3dab4a6d9089530aa155c25f409a9800d914ee748b4044e3c539063e401e97
font_01_sfnt_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 10972 bytes
SHA-256: 0ebe3cbb3b907202468bb53dec645982d554ad308e7aa298535e3685ecd37232
font_02_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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