Malicious PDF — malware analysis report

Static analysis result for SHA-256 441fac7f8d132e5f…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 20:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20331530b8cb7af9f96028787d613f24 SHA-1: a6e394ab1dddbdb5352a6817191cf2108b577919 SHA-256: 441fac7f8d132e5f9b5defe2a7aded95a6779507effcfa4f5e8ae7005e82b979
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or malicious redirection schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=masud+rana+series+bangla+pdf PDF link annotation
    • http://cmtdental.com/upload/ckimg/files/losevisironuz.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f116b3986f---vagesonuluxod.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/95843299683.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/94367883419.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/87dce3be8d14fc858a333187b8ae1e6c/jekisoladumugelimag.pdfIn PDF document text
    • http://bdn10.cz/files/file/60423256254.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad0443e431---zumagarise.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087f92b08434---35465745595.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/34449683371.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/jivepewuladu.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/71387015579.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d93244a3---2527819877.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/pizimidiwawok.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817db708182---981609504.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/31488680599.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/xirudan.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210808_069E6CC94F65EA80.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/99914661375.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/92102551749.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/zokapofasefeganulivaxifa.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160785f64e218d---metuxuwafizelatetuvuwagej.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/78164156975.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860af96dabc---99940883386.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_off0000d042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 18092 bytes
SHA-256: 795e0d426fe6fe38fd20d99e594500f60e99d376f35bf64144d1592a2bec3534
font_02_sfnt_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 10688 bytes
SHA-256: 3f3447a029738b13f3e0277d5e974cd4e3d5a9b55fcb383a783a9c2cae18ecde

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