Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc91af54a23a71a…

MALICIOUS

PDF

87.0 KB Created: 2021-09-09 06:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9defc0e4003c2a0318a4b4f22ab64a4f SHA-1: 6fa42160c03fb678b7fe4c17d3a03bd5bfc8ba66 SHA-256: ebc91af54a23a71a5e2a0db72d2123973749e2b607c3e897f7a1a1dd4bcef598
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external files, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or social engineering attack. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=popcorn+time+download+link PDF link annotation
    • http://alfonsoguiggiarchitetto.it/userfiles/files/beronu.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/sesililopiwazebe.pdfIn PDF document text
    • http://djapm.com/userfiles/file/gikudivovufugezewabu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613674bb0c241---nusaravosimixelo.pdfIn PDF document text
    • http://opersan.com/file/lezudixaturipo.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/64123589182.pdfIn PDF document text
    • http://builderall.info/userfiles/file/11172932812.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/mefezevapaxogetazo.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/moguw.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3mr4ir78afvs8gbrneggb5j746/fixugoputoguz.pdfIn PDF document text
    • https://jetaime-shop.com/files/fepurenut.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/51287222775.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/64327551337.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/47892da7d02b5921a58e919bfa6b0140/lekawu.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/19021822096.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/5037029534.pdfIn PDF document text
    • http://mamam.by/upload/File/file/29852972429.pdfIn PDF document text
    • http://underbutter.cz/download/foto/fozopojevij.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/21124387599.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/6485187471.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/12364948035.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/54691770357.pdfIn PDF document text
    • https://longhoang.vn/upload/files/zenoxow.pdfIn PDF document text
    • 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_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 18440 bytes
SHA-256: b1864b84b9fc978cbae25c7cf5d0bcb277aba4ee2baff0ba70a9880d9fe67597
font_01_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F3 10684 bytes
SHA-256: 5b5c885a5853e6dc1422ff743e1c669660f0879d9feee734b9b0c26d15ca10c5