Malicious PDF — malware analysis report

Static analysis result for SHA-256 3335dbabefb58c81…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 14:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 15990cbab2e09f5df5e0c2560a616a64 SHA-1: 80a1f0618ee755d3861e0793a526a44af7517908 SHA-256: 3335dbabefb58c818b4b0cea9395e76f9a3cc5b239080f9774757750be468a1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.deep2001.com/images/library/File/58525715397.pdf In PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/bibewixofososuneril.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/93721076328.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/ronexarokuxuloriwog.pdfIn PDF document text
    • http://minerva-collection.net/files/files/77137865507.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/8lfc15ld15tnn9t40uh6gpecnn/nipatoxol.pdfIn PDF document text
    • https://unitjaya.com/contents//files/mosexovupizuxekigoji.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/79831813620.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/91ff0f2ba1ee7914b2c47fcffd727a26/vitefilimarenanevodim.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/q7hhr4etgj7nk6g9uhmna3l0ep/89789688195.pdfIn PDF document text
    • https://panama4d.com/contents//files/24789484643.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1e22193ab6d5223efdf7793c6c3e13c2/15274238888.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/72439213134.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/zejenexi.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/36472773346.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607db7a2b6ab8---fimon.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c0112af12---fuxokibotube.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/34789581291.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607426ec3dcc4---bupamilowutup.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/wuvareviwuru.pdfIn PDF document text
    • http://patroha.hu/file/5089389769.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/15576388551.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/kosorajexizizopanuxuve.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ea0ad50470ed686350cf59007fbf664b/73640792187.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/mawux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bohemian+rhapsody+queen+piano+sheet+music+pdfPDF 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_off0000cc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8D 11252 bytes
SHA-256: e051cd8afa0a1972611fd5853a7b8623fe51da92ca091e0e56d71f735f22d644
font_01_sfnt_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 20456 bytes
SHA-256: 5c2393b6fd5822637c8f3a1471bd7bfbbb217d9eb58574b9b06e2078dfef8f46

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