Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d061c49bcf2b4cc…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 00:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0cb0b34f0247e820284aad307dc23c6b SHA-1: 888afca60639c888f29c011040bfdf9505e56930 SHA-256: 5d061c49bcf2b4cc441f2c5bb4cdf98a481c3c77c2342b87491b7100003acafc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to numerous external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://zenithoverseas.com/assets/userfiles/files/memujezumukelapojisevoz.pdf In PDF document text
    • https://maviet.vn/upload/files/komirawopuxe.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/0vdv67tqeuqtage54fcvpbqr1d/38235800436.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/26507750073.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/78352643621.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/30982496347.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3bd0606368ac42bd4709ea79e11fbb7d/5876694915.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/fisetavakixolasaso.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/keronudafuwizilan.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/vitil.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/47174007263.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/xolupilapefusa.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2b65000eece335b33933d5135c295e25/delisuzuwofemu.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/divojanenobiwaxuz.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/89014995062.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/22059582359.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/h96bn11mlgkck2o57fsst6dbv5/jidures.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/39347361594.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/fufosoxudakinoloj.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e48bac714---nizimux.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/xopipilikupofodi.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4b77d50f9fb035a88a49042d83a1cb35/bepikunaviposil.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0c31b0f69e98b41357137582fbfd5194/wizawovaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=product+research+paper+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 17636 bytes
SHA-256: 7a3bbad32ce26f02e0e238a40c8573863042a164f4dd0233ed142cbba135226c
font_01_sfnt_off00010eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAE 10576 bytes
SHA-256: fccab2b2016e6a1e3f01eed00cb546fe3a8c4eb62f3215443c44e7a37786f161
font_02_sfnt_off000126fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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