Malicious PDF — malware analysis report

Static analysis result for SHA-256 46a1fb9c25aaa14d…

MALICIOUS

PDF

90.1 KB Created: 2021-08-08 20:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d98997f450a686224dbfb5a373833af9 SHA-1: 6b0da23d01d9f7d53e35c0a0888fa4d17af34fa2 SHA-256: 46a1fb9c25aaa14de531f9364f660a859bf775c7fdc3090b555e6ca835aba742
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/612602ea3dcd7df6eb0681e1795452f9/fivonomisiw.pdf In PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/fofezakelavek.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/a3d189fa0195d625a783755d2648adbb/7032154022.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60366337c---vodabajaxusarujila.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e1fe15cb3---betoxirunuzixem.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/92586103703.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/04dff3893509f7b6307f0deccae476aa/pamanuro.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0357307001625009096.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/xuxetasewotez.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/83874c202be3bc729da441b72d62b5c9/gidalisamudexiza.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f2dbbeb9a---65575720459.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/28950372395.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d12fcefaef---23823446561.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/94930649946.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097e154a750a---ludazepotugasigunase.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/badipavove.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/30ad682c5bc3628b7692b6e5ec0dbfca/fifugifixoraxuwozel.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/ada839899434154b093281d5caac65fd/tuzotizutofug.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/72913719318.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/34887573510.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b848ae30ac---82032923931.pdfIn PDF document text
    • http://abpaluso.com/upload/file/58744284615.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/18370873690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+does+two+fingers+together+mean+in+sign+languagePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/eb826313118d687ddc4c3264617f22d4/molafu.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_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 17404 bytes
SHA-256: 2017b85aaf8857a3e5592e7f80e6d30b8bd9bea02aea830e0152c620671d6666
font_01_sfnt_off0001261b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261B 10980 bytes
SHA-256: 02d4765c2e0cbda8124744d8df4cfb74fee626852554dd91f21957275cd2f24a
font_02_sfnt_off00013f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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