Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4d4f58268b49f6…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 17:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c6b6fc01bcd6cba2d7da48c231fd981 SHA-1: a3ba4c6d40d5eb8619f5efaa9fb3b249ba8d9e85 SHA-256: fd4d4f58268b49f678bc63ba7a429bb8724d84c63f5f03dd7e99e1108a4a3d13
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to PDF files hosted on various domains, suggesting a link farm designed to obscure the true malicious destination. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The document's structure and the nature of the URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://rollfactorytogo.com/uploads/files/bekugobifobifowonakin.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc3a239c00---babobejovapusufufod.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/90925012407.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/7904929282.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/44708437087.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/dololejujerelupesozak.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ba649609ebc---59750627267.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160843237ea37e---kejakogenusokonavusititif.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc81c4fab0---fuzawazirivajomatixore.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/35122620382.pdfIn PDF document text
    • http://fygl.net/uploads/file/201750194537.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ae849a59bc9f98660ca04dc428983d00/pipuk.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/49ef28c0a7c34cdeee6c71562ca290d2/rawor.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4288a4a05---segizinesabajami.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/fivomavosat.pdfIn PDF document text
    • http://polletnv.be/uploads/files/jadisanaxo.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/nubab.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/cc51799906dd6bcba1cd64a17f388337/56516027876.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d79d9e3e---majanometu.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/33294173497.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/16226672771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=convert+word+document+to+pdf+for+freePDF 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_off0000c0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 10596 bytes
SHA-256: a6ae89e8ec6ab1c5dfbbe85c0c620016ca3ff7f04af6ad17495af2da77487439
font_02_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 17600 bytes
SHA-256: 1672351186e335f03c94a3281a8078da2a8c4c8b47f38f86933243d5286614e9

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