Malicious PDF — malware analysis report

Static analysis result for SHA-256 c714919bdffd3d53…

MALICIOUS

PDF

89.9 KB Created: 2021-09-01 13:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c726fe08aa2232a47c45482982b52386 SHA-1: 06f246caac2f09fd3ddd9ffde6695deaa4086207 SHA-256: c714919bdffd3d53988c18571c20876188e7836045e57354f0b657271f36bb9b
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mut-zur-veraenderung-hambuch.de/userfiles/file/xavogekivonatotozuw.pdf In PDF document text
    • http://goteneplast.se/files/images/file/radojudajomavakevipifule.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6be7a150c---29593280687.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/72339877555.pdfIn PDF document text
    • http://chengzechem.com/upload/files/jaxebubenimanijuvufaka.pdfIn PDF document text
    • https://2acontractor.it/images/file/livasipudezofus.pdfIn PDF document text
    • http://apvn.info/userfiles/file/67458825848.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/13d5f418f1b5d5b69ecf892a5bdec98f/16616583596.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9101879fc0---mologek.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/8229330609.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9c2d508871eda072815a4876f6fd21d2/wimapimiwoxajovi.pdfIn PDF document text
    • https://rcot.org/userfiles/file/tiwazeditutitebupipopu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf2a547ad1---fetitukolafuj.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/bd80f7a66580ec5408baeb6748248dc6/43691045830.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4fe6d094609cbe23d264e48167408bd3/18629545517.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/defunavejobado.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/55622a8b83c618625c70606b37b46494/59652582332.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/apm9kj57iqek911141uasf54qi/budorumovulapezokikewu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/sopupofepuxuwuk.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/lebobitomavunete.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/pkcf7a9kdqrltkiq4ifv0jlabe/18385050171.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16119fdb55134d---kawalub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=example+of+musical+symbolsPDF 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_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 17648 bytes
SHA-256: 59c2262fe9f36949a3797c892682e1c962a5db661e4bbc58480533db7fbfd026
font_02_sfnt_off000140e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E5 10776 bytes
SHA-256: 05fc396586fb6af931f46fd394b78243462c679e394c706ce5de6e37c965e0ed

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