Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1909a3c892c6a76…

MALICIOUS

PDF

101.4 KB Created: 2021-09-01 21:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7bd20a32ef5cadf990e03f40770a287 SHA-1: 19f500d15a86f5486ba3d27991879c1512da3c4a SHA-256: d1909a3c892c6a76d4ff89a4bee358cd95f478c9f8766d619e5d1cf3e302ecd2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085e6454f2f7---revibatob.pdf In PDF document text
    • https://mavachhaiphong.com/upload/files/xamarobitomanezaseg.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/lopulenekukufovupulalam.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/jabop.pdfIn PDF document text
    • http://recrute.fr/files/files/gutanosemazupepubitifete.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/kaxewabawupulakofizuwu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a82910822ff---liluverataxakubizuvubet.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/kozob.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/94894822557.pdfIn PDF document text
    • https://ski-experience-japan.com/images/blog//file/4692745440.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8570e8af---74795766802.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/nekolavijawizamokade.pdfIn PDF document text
    • http://skupka54.ru/upload/m/gubupuriwukuj.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801e3dafcf6---bodojubazimigazasotako.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/7ddhuh21lo68kqqe0s15953r30/87956187542.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/nozupisanogisix.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/nasovasemawoxewomesiwape.pdfIn PDF document text
    • https://alariel.be/userfiles/file/jofuxejewal.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161176b80123c9---naluwimuruzatik.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad07e424f5---21790048027.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9d8d30560f4783ec4cdfd958b195e166/wuxejawebivopedonev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=middlesex+by+jeffrey+eugenides+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_off000126a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB4 18408 bytes
SHA-256: 09b0d6cb82e77f120ea12cb9170d60c83e60019ea0e1732f926a4eccffded673
font_02_sfnt_off00016e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E83 10872 bytes
SHA-256: cea0694af5dccd21a099dcae08d6ff29b780dd4560cbb87a5a207bbffadade7e

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