Malicious PDF — malware analysis report

Static analysis result for SHA-256 f263266b73b6be87…

MALICIOUS

PDF

72.7 KB Created: 2021-06-27 06:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cbc454e1231581d9d73a077c9701935c SHA-1: 7418e3707e77a3a6161c1baddb77a57875afa0da SHA-256: f263266b73b6be8726a011bc2374d3f877942f02749bd0d7a5ac5efdde6be530
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=role+of+joint+information+system PDF link annotation
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/44f95fa8f3537b5085be911e4c8e5eeb/66203132348.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68284a9031---nelosemamixefa.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c6330791c---87052922502.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/cc0ab6cf93d64a89dc592f3019d3a88a/setufaxiruwoweladosas.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/ravevawutabodo.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/0e7ce13cb1c1c001874b312e73bbb7d8/22055119828.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fbd536e38---nirotonanivexanaxazube.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/p3p6bh0nidbbk88n3tto2n4pl5/37709566012.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/sokariwujew.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/zakoz.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160797b95509aa---sotade.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/pliao5khplhijt0vrs330tsgv1/vadaritidojire.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c379ab86d45---peleresutogujex.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5lkjic77111klnctabla3t47h0/1426205469.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/58632e2dfbb9983a0c61e246831273a1/54700281977.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d7df417e1ff---24991047216.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ol6bpl0r5mn4vs7s0g2sa1si2f/83056824142.pdfIn PDF document text
    • http://skupka23.ru/upload/m/bamipenurulevozokevo.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/bibuwebemirodolawoxod.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17fe1c64a---jukosenipeko.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094655a1fd59---2242201938.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/10a8bd0b370309e726829e46839d5c31/97996022641.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/nilubedonepol.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c4893b8f7a4---dobobonuropimole.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 10664 bytes
SHA-256: 68c1ac10d09a6a883b0f6c058622d0408c021afefd5a6df7be8f3266cfba140b
font_02_sfnt_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 15400 bytes
SHA-256: 5ceea1638ff28742aba770043dceaa7b362ebc4240d211cfcc6290f22b759c64

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