Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8560cde28be5e1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 19:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dec8eb9ddf46330a7476d23a3081d352 SHA-1: 3bd878df9dfa56f035df30d53519620caca001e1 SHA-256: 4b8560cde28be5e1395a61398ef43af928e9d513df7db4ae500d2c7b40e746da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest an attempt to deliver a second-stage payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=star+photo+stacking+software PDF link annotation
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hcklhaofaruvig4aeittak3ep1/xekixezemigala.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/nijetijedivirezo.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/sogugifanabuzojiz.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/vulovakajimetolibered.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613347065b156---pixukudevekujunewijid.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/34425906384.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/13991397117.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebffbd0e75---51783077076.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/78966312919.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/87579726301.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b78e5373d1---33407842981.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/65647442237.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614022927ec4a---kuwifixuwaxepopoworek.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/83246610831.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091411043573499.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/vajeziwosikupudeti.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/3908260696.pdfIn PDF document text
    • http://4darchitecture.org/img/all/bekeliwewemuratupap.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/gatumuxefatarutopijak.pdfIn PDF document text
    • http://thaide.org/userfiles/file/7722280693.pdfIn PDF document text
    • http://coumert.com/images/file/77956166913.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/moviwa.pdfIn PDF document text
    • http://bienbao.net/uploads/files/lajafiminafuvojatisujo.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/tewakikenimatuzuk.pdfIn PDF document text
    • http://honghuibio.com/d/files/16555208095.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/84577638006.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_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 16944 bytes
SHA-256: f05c4327ef0aa64c30ff20cd021be4b7cc92e1c9dcf8faf4b5ed12b99bf90a03
font_01_sfnt_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEB 10968 bytes
SHA-256: 25d7b0b121e06bff80b78146350af4824e29c0c3d535eead0fea1c06e60ca9a4

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