Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fe012aadf9f637…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 06:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 69d91c273261aca66e59396be46af9e4 SHA-1: e8d22b8e956a1d6c9d1338dcfa943a1302c488df SHA-256: 90fe012aadf9f63739ed201a99c62ce85a79c5f6cb7d09ca0515e9fade06772e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the structure and URL analysis strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://rochesteradams75.com/clients/7/77/774a1ed2e17b5a3c8fe4214cc08eab78/File/98747344525.pdf In PDF document text
    • http://munsusa.org/userfiles/file/20210609090623.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d99a4d7f123---vuganadapuje.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/xibat.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/6b5eb82f8389a27ca79d2e92711cc21e/zijuxub.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607e52b0c2e8a---zasotidabirewekaxojilem.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/3ac949a6dd634df76b819644dcccac90/76527251216.pdfIn PDF document text
    • http://jucal.es/images/file/litarasopat.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084bb95deb0b---9692391810.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/tuzulibokogi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43c86652f1---42771870407.pdfIn PDF document text
    • http://o2ashop.com/ckfinder/userfiles/files/27401685602.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/60862665098.pdfIn PDF document text
    • http://wenxuezj.com/images/File/melapobekepagozoxevoler.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/ruwuzawedukazafuvudasu.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210709115512.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/janivutusaxomasarobudeg.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/wibegezinubobijofozedes.pdfIn PDF document text
    • https://mmszke.hu/files/file/6749005821.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///24543296407.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/80090845164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=difference+between+prokaryotic+and+eukaryotic+microorganisms+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_off0000cf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 11452 bytes
SHA-256: 936a7971d506841e814b27b47188499ef2b0ee52be30be630bc49ac32aa0f56a
font_02_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 18032 bytes
SHA-256: 0b612531902959c320a80f615219b7ef7eebae5186380eb5d0713e9eb89357e5

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