Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1012877b22fd0ec…

MALICIOUS

PDF

77.0 KB Created: 2021-09-22 09:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d9828917f51c1fdfa1cfc20204264f7 SHA-1: 695eba3f1d0933f3c404c010464e8346ac376b1d SHA-256: d1012877b22fd0ecc855ae7d11850609540e888eab4a8be5bb3345519d67aad1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • 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 https://chcial.ru/uplcv?utm_term=gif+maker+mod+apk PDF link annotation
    • https://denimder.org/resimler/files/dibosum.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/dizozi.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/75685294666.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/kisuxezugujovokevabime.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/zulijesigeruxomepuzago.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/50650144780.pdfIn PDF document text
    • https://armenia4d.com/contents/files/14857048057.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/vopidisivave.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139b1de8a887---sinakadexurewodinagupuv.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/23968392794.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/24531694722.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/wefipiraga.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5ptolppb2qq7ifse475v3ha1nm/25003357854.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631946644.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/26087726625.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/tejajo.pdfIn PDF document text
    • http://k1a.ru/images/files/file/fumusejafufatod.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/juzupemog.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/d845017f1d12955117f8e21b80556a7c/wukodawofemekefigo.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/54113531052.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143217a845a8---83248763167.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/7506969727.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/libanez.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135529d211c6---pafebis.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/89457882732.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/fivutunuvunuxixijegilom.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/govonokugoto.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_off0000c35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 10372 bytes
SHA-256: 4c19feb31963172c720d94c96af44e883acdb8be07d945a7744c510e98476e3f
font_02_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 18960 bytes
SHA-256: f9a59acf965073d200ccfa9c2138ddad21c2622b86cccb0c91629ffbdf1bbda3

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