Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1d54044d82cb1c…

MALICIOUS

PDF

86.4 KB Created: 2021-07-16 05:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f41a65e1c2c351be8d575da1fadb0a58 SHA-1: 1e658ae5638839dbb19a76dc7bb2bfdd2e578e3b SHA-256: 4b1d54044d82cb1ce62af6279dbcbd8282383b4f49e1d70b82ad1555d2be6441
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://szwygs.com/upload/zadidodufa.pdf In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609a78a11262f---6212025855.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cttev3qets86asiiccmv1s7lkg/zogudelagopotenoz.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/75999490124.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca60228a1---38608288427.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/99461579038.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vdfq55lv6ac2eqh75u1iprt23f/fijolipoledowamojum.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/81476509278.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78cb5aa60---famakupapibuwob.pdfIn PDF document text
    • https://csodamalom.hu/files/files/babagovomiti.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/26974485379.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d8f46f6f---89964836543.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/83326211895.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/60512934603.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e4ed146bee3954bfe0cff6071370ec3d/79640591946.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/23848686638.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/savonanoluxufuzaxek.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/80703160678.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160783f07d7f74---govibiworabox.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdc7de06ce---79366292256.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210621_034341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=at+the+end+of+meiosis+1+how+many+chromosomes+are+in+each+cellPDF 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_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 10976 bytes
SHA-256: 248de67b898126f6f1257921168d919a34c62db6b1a848a6805ccf491f5add81
font_01_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 16704 bytes
SHA-256: 995a87421de092b1f3b7927a10495069b01575bc441eae16c5cf29f0f54db3d9
font_02_sfnt_off000133cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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