Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0819f9a580a00cf…

MALICIOUS

PDF

71.6 KB Created: 2021-07-31 23:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 95eaf4ed4d8dbfa8e83d430295b53c1c SHA-1: 06cb5d500763db43f8a8ccd50008eabc37c07b9a SHA-256: c0819f9a580a00cf17d155c7ed6c8e022682d604832b028450db1d0c16f900bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links are designed to redirect users to potentially malicious content, exploiting the user's trust in the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://universalthailand.com/images/uploads/ckfinder/files/rifolejaxatixadino.pdf In PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4e725d158---28425895464.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/44563972121.pdfIn PDF document text
    • http://aimic.com/userfiles/file/gefokamolavivamaxi.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608da39ee7466---lipopapepov.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1622952838.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/89367016545.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/npaefj5c4ook5em64m8ig2vk83/gaferakixibedul.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e17c1bc8de0---14540231768.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b3386aabc---bimopowumidavexezimi.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/dinoxesojegi.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ab1c3fd695c9f787ee043a65dcb3f8e3/vemomu.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78870400095.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e131c169a22---94818962208.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/79400299146.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102c6ce56e5a---76218748593.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/nulabawezefowepapij.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/zuwozenalafegunoz.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/tarabudawirewupegewafo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb3fba974a---45982897128.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/gavezekibonomosizabelino.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/5013728052.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ad1cd4762---rekegabanulekox.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/xogedepixixur.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/dapivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=net+framework+4.5.2+offline+installerPDF 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_off0000b8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EA 15128 bytes
SHA-256: d2e5a24a44b2f5cf5524b5df9d9a30333475a122ed5ea3518005441f4a3acb6d
font_02_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 10928 bytes
SHA-256: 19a13571363387a443097af6dc3e9dbc99e66755485fbda6a2140291164ef94e

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