Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdb4eddfeddde46…

MALICIOUS

PDF

72.7 KB Created: 2021-09-05 15:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0749ce88531de4805b057238d1620062 SHA-1: f26402194289fd69e0b0c5af4007ca7ee637ea97 SHA-256: 3fdb4eddfeddde4627c91c8f3a0c973c9b2e880695b40eae296e1ac4b4be20dc
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The document body is unreadable, but the heuristic findings strongly indicate a malicious intent to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=how+to+add+page+numbers+manually+in+word+2007 PDF link annotation
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/6vlkgqljcv531p716gfr4fmcgv/93901329158.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/bejuzanuwipanivopu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c53ff8efeb---21373043133.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea975da20---84250998683.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/40430b527b47c0865191d346d90d4a78/36612137560.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a867c6fb8---kojixafarara.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/6ed3e81292b3206c18312658854869dd/tajejakipitu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f7f9c53f58dd7a72c133cd9c7307873e/21455912000.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/72547467608.pdfIn PDF document text
    • https://cmoretv.com/userfiles/wudumibobexizivotiso.pdfIn PDF document text
    • http://mousike.it/img_ins/files/jokozemukimeb.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/runelepogovirezelamer.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/foce67p4ju56dgm8e12qgmci7p/butuva.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/6b052808fd68b140cd2ea1be396be852/35269485548.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/91397009140.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2711c5f218---busamiweref.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/b30211tk3ps2vs906teom404vi/50657640153.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/fenazojanogepurekizagu.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/4542165355.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160becd0fd80a7---38869764680.pdfIn PDF document text
    • http://indel.sk/userfiles/file/26816538429.pdfIn PDF document text
    • https://bursac.net/userfiles/file/gujipipazutusok.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_off0000b7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DD 16484 bytes
SHA-256: 57c4ee7d5587cde6fc0766af89b957f92a1c25525802891432cd75fdd4fba5af
font_01_sfnt_off0000e29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 11456 bytes
SHA-256: e3eee4c641e32f9fa7b141cd147d7c3ad265391943df6096d431e47770a87e12
font_02_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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