Malicious PDF — malware analysis report

Static analysis result for SHA-256 050a728ffde6c891…

MALICIOUS

PDF

90.7 KB Created: 2021-08-07 04:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 9db41a594432972507fa2d029dc14d9d SHA-1: 71aa36d4bb2e1a3e889c77c5defa07dec0ed3c9c SHA-256: 050a728ffde6c8917f21af44ec8bc57e38f64a1196e4a9072c1f3eb6b55524d4
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 a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised websites, suggesting a phishing or malware distribution scheme. The presence of multiple links to compromised CMS uploads and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/6901038597.pdf In PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/warilutomajumuzawuxaxu.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d01905b5c15---66810505497.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/98c28844dfb9d8005c4b576eba3e2d4b/renanojigukuk.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d9b6df9443088ba1a71c616637293c3f/1416156160.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c30c550ecb---voveniruzawipi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c78fc4f8ab5e442064fd848e07ef18dc/wigizuve.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/6n9kffqisnc4108a1egf9gipe4/40420890846.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6a79c885e---26717629050.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078445d22ea6---gejiragezubar.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/6318209601.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1624219885.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa92ae5be05---93251769269.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/xipelabuzibirobigesitoli.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/lotudebonan.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/c912253653b1d7043c18684577579d60/6063424966.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/80387752576.pdfIn PDF document text
    • http://abnicum.com/files/file/damozumajavatagefadapovol.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/wagixusowixegatudadujuwid.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0738002ee75abcfc87ff8af6fb0032ac/44960644617.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160828e6395740---nodijozaxuboja.pdfIn PDF document text
    • https://jetaime-shop.com/files/lowejawojatipiratinebug.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607afee9a81f4---xigegufuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=s%C3%ADmbolos+patrios+de+honduras+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_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 17976 bytes
SHA-256: 0c26c7c029117924f13493d47407fe6048fa08107e0d89c0fafb48b7e23cc123
font_01_sfnt_off00012893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 11140 bytes
SHA-256: d16a5f709f54505c02e48120a4d29c870c2c68340ee4183b7398ce72718f4d2c
font_02_sfnt_off00014221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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