Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda285c2b62f3be1…

MALICIOUS

PDF

105.6 KB Created: 2021-06-25 22:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8b3fec63dfc63990c71bea41dbdaef06 SHA-1: b7bf1abb3d0b2e253f0176780b7bfd1e3a530f3f SHA-256: fda285c2b62f3be1e35a17d648ddbf52f657c7ccbf42ef89e2f9de01dec179a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://archism.ru/uplcv?utm_term=bsc+medical+physiology PDF link annotation
    • http://www.deopendeur.org/imgUser/file/48565448283.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/sh0i8pvph69p43attg3uivlgfu/59319702642.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/xexasoxokijipevej.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aa00cea64---16228340410.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ufo7eibnjc72og5kss6evctf6n/36772335552.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/salixa.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ha8ref49mhb31fv996imlv61n4/47095550830.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/94ncdralrr2ap2j6679uu039a5/ziwomudukufisa.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/firakuv.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f02578609---25545720098.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1d0i7a88p7qdvt66u362l6t7jq/35990020630.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/fiwezidixekevinek.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/3803199330.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3nea61rf0vmsp375vd8e6ugthm/56794117209.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076d594c3774---zagemebagoregojinevalis.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c6e2397c5---denajupabepefaxofivepuj.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/d0a7b06kn3k6b53v1qts5j5go8/sijabatirunevinig.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/vorokujupe.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4607db758f6f9b1a005d657069e816bd/fegimikusilunopufabafibux.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16089582959596---visofojitupigoluloxe.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/vasabijekosu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ogpaq0q0im7kpsddadd6hvrfce/6131049393.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/84ff2da70a36aa6a26c56dc161629233/84078613798.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_off00013ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC0 10828 bytes
SHA-256: f6bab97640ef4d35ae3cf89cccca01ae1caddc9d4eb73815ef160abb31f4cd97
font_01_sfnt_off00015387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15387 17456 bytes
SHA-256: 3e9c780c853157af415da86119ff4bc190c4e9119cd03f06d9712b5c05adf500
font_02_sfnt_off00018154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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