Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f1250212b874e3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 15:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72141053acc0bbe25f8d1525e1d59dc4 SHA-1: cb5de8c2f993e1ada938c18e11333793b71a5d87 SHA-256: 58f1250212b874e3d456d1d3bd17d574fae35eb23728c1e9c59686f15ba88164
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/65f05190a5dd0756235e17ff04819b08/1295931631.pdf In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161422424dc73c---79926948188.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/gozepafimelewojap.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/75328973613.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/55984238815.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/46649788194.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/41211672003.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/89682282521.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/72430840003.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/6bpplckredssduc8k79dapjj1e/sadorafapazivonijoxuvuwug.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/7278477450.pdfIn PDF document text
    • https://autoskola-scp.com/files/surixirijupop.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/zexiwumobipedavatore.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ccd7m8spo13ksnqaunfkthj0ei/zesatuvurupexamarot.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/limibinovavosodumuwiregu.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/37168794353.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/tuvorusaweposiwexe.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/63906783452.pdfIn PDF document text
    • http://tzsunup.com/upload/kumutuwajumikonefore.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/21251556129.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/zisuzok.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/pixupirepope.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/78519481365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=brooklyn+nine+nine+season+2+onlinePDF 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_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 10384 bytes
SHA-256: ca09c05a9392ab8ea9bb0b3ee5e5436d9d2efdfd61126a0277dcd3c8086ddd10
font_01_sfnt_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 17408 bytes
SHA-256: 0d8f744f96df2147fb2fb740cd477d47d488f0456d421432dea7ae4bb973efd0
font_02_sfnt_off0001209d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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