Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc030b64e77f33e…

MALICIOUS

PDF

87.5 KB Created: 2021-08-13 05:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 717ad68707b1afe72f5b6ed4bf928571 SHA-1: 86c067fce645b280f9918060cdda84d8ffa6ebbd SHA-256: 5dc030b64e77f33eda3d814b61bafaf7ab03ba61485e73486c8700be00ec5538
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 it likely serves a malicious purpose. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of external URI and link farm indicators, coupled with the overall malicious verdict, supports the classification as a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://tfe-design.dk/userfiles/file/gonopasunabezalufi.pdf In PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8c9686519---2961383921.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/buxemole.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/79736926358.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/49238518471.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/38557927130.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/genoliwiluwugerifapinuwon.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/75391623620.pdfIn PDF document text
    • https://mollis.rs//files/birino.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/tudoza.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/verefixepelusomopavum.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf8b9ef03---67994208039.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/67785afe3e8ff115c3e08a34e6aea722/nenerexuzuzedi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a176358213fb8ec0d0b7c2ea49931252/80345373529.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16115c92f28069---sedorixorosog.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/tatagika.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/o0rm9h6hqdn5n3f586kqq5941k/17963246691.pdfIn PDF document text
    • https://eventaipei.com/upload/files/68733896144.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/2797389880.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/87353407514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=arquitectura+gotica+en+italia+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_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 10856 bytes
SHA-256: 3a07cf663b0ba5dd22b8dc039d70c8991e7059af826aca37beb7db4c95c54586
font_01_sfnt_off00010b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B94 17052 bytes
SHA-256: 89f7b666608b884aae17602353c62531f508800ee21db96b99daf63cb9945f33
font_02_sfnt_off0001360c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1