Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f4c0214797f135…

MALICIOUS

PDF

99.9 KB Created: 2021-09-07 11:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c0af64b536763fbba8488133da0b460 SHA-1: 1289810c32c202e0014b58e659ec360812a5e8f7 SHA-256: 67f4c0214797f135fb966a83402f31b36828d4aedc97cc4a30e4a4da73f29349
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. The embedded URLs suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sunjewelsonline.com/userfiles/file/50132301994.pdf In PDF document text
    • https://matratva.in/userfiles/file/kawejapitaruvuzerato.pdfIn PDF document text
    • http://ccsl.asia/files/nulezebev.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ee8f0d832437f39fde6626d6efe232d9/86011303241.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/69312204122.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/zolofevajuxe.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/wumetigokisax.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/50449069722.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/6159ecc4c40287d2c12a7093e87df043/66896836802.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b040a78c92a9f9b0e7641f8cf86439f1/94099376759.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/rogigusesawezo.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/ridor.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/dokolesotuwojar.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///1381439980.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/sisaketujibugixanenakam.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/wikavapumi.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/35805647361.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/mizaladetajegivegafopo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/48063819ee64136629de3892194b574c/pojubizekigawobigo.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/91366528932.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/lujelorag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=harry+potter+sve+knjige+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_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 11020 bytes
SHA-256: f1180ec1d4a7557a3fb68657024e4f9c810835e3c499b6e079b71b05b8beb4af
font_01_sfnt_off000133cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDD 21308 bytes
SHA-256: e7e11182276477901b96f0a1e9ba6b0b8c990f2f64b5bbb2532a1d56dbc88a30