Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8baea4386023fd5…

MALICIOUS

PDF

100.3 KB Created: 2021-08-01 09:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3157aa43a12db7024a8d0d21f40b2b66 SHA-1: 272f0c28adc4bde17e1941887858dd6518e5d6f3 SHA-256: f8baea4386023fd5da4f4d3af9be00378904df90cbfba7194321d97d9c74dd91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be SEO manipulation or redirecting users to potentially harmful content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. No scripts were extracted, but the presence of multiple external URIs suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e1c65d50a31828f5ed67774609cd38c7/gireni.pdf In PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e23fbe9b75281bd0cbbda4ec2f8bebce/55522073067.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/rimizabaj.pdfIn PDF document text
    • http://antae.be/app/webroot/uploads/file/votirokagukazazirebezeru.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730d30afb6a---jupejadatawexevetidi.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/gatawevorotumosogew.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/83572919390.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a79cac409a1---38489420985.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/54496913830.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/lakitukeru.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/jadawatamokepunaga.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/3r8slttiq3fp75hk15boitcfm8/15209954284.pdfIn PDF document text
    • http://fruitvita.com/files/files/lazawa.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/5a487e5d0766def3e6559d897bf806d4/wixovanulamisafi.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106300741.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/vubinuwoxosovafujuxepopo.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90a333850---399461905.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f836fd996b---sunixiwex.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/nojojawazoruja.pdfIn PDF document text
    • https://ivaco.it/file/41398729181.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/16883737650.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa64f7c93ea---zigiposazijibojinumezodis.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/dirozib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+make+laundry+soap+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_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13920 18116 bytes
SHA-256: ccaa79909f0ca74689d0a2d389d19ac9b32c55a810809d006349ea198a9782ca
font_02_sfnt_off000168ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168EE 10948 bytes
SHA-256: a202285a58229d668f015ed02a4e61d407905356ca8a7373d60d34d6d3267238

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