Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4b897cab8bc40c…

MALICIOUS

PDF

88.2 KB Created: 2021-09-17 17:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b7c6dead40ffb32dd679dbb3b574a95 SHA-1: 98ea686dd3942df3a192e11a27b0855428863eba SHA-256: 4c4b897cab8bc40c431dde69f913267ef7e5d83fea3e2385e388726bf5605b04
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 WordPress sites or disposable domains, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://cructi.ru/uplcv?utm_term=housefull+4+full+movie+online+play PDF link annotation
    • http://good163.cn/Uploadfiles/files/3744807587.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/32970995573.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/43585155853.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/81eddcdca4f50232d5bbff9a50ba75ae/47861418114.pdfIn PDF document text
    • http://ipceurope.be/assets/file/63192312275.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9rf7l3ja50fkid4mlk7oripecf/dotonog.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/pipalomumirorakosidowele.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/gazewil.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16143851416348---fifasavoxowiwiwujog.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/89535264399.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/vutosovalonabokugedenalas.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/nujazepixave.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/gewopeji.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/degotukadujuxizoguxit.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/50232849536.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614469a435df8---99784434304.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe776e4a1c---kofoka.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/61852393970.pdfIn PDF document text
    • https://bor-diing.com/upload/files/daxarodemazaneleselegi.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/2374198396.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/12768982414.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/45461496028.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/beguwim.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/45655748459.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_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 10668 bytes
SHA-256: 3d6b1a305876a735bd1d66d42f95bd4a61b80b2322f3bb4dbd7d3d6f8558586a
font_01_sfnt_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 17948 bytes
SHA-256: 4047a3722b7352b93b658448255a287a0631644a87a6f8295bc19c9e0a6ba6e9
font_02_sfnt_off00013ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1