Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3893c31c118104a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 02:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b632d3405c2dea5d1b78064d1a9da8a SHA-1: 9f3884d019f05a2ea65735945ccb720c32eb80ff SHA-256: e3893c31c118104af4cbd44b4390c5b96e3483e010827f5093af92c1b0a0404d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to external resources, many hosted on compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The 'utm_term' parameter in one URL indicates a lure related to cracking software, likely to entice users to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098443ab097b---ribefujasixewuluvabi.pdf In PDF document text
    • https://dananeye.com/uploads/files/202108231224137435.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/u988qpiv8tgkacaebkb2v4agmd/62122627941.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/68288476357.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/51374313273.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783de609ed5---71588053243.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b5d0a34824ff6ca6e6c899d57c510b0c/gamusi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f9b8e25e4---1965244649.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/zuxoxoba.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8a447ade0---rimitalipezuvetirozid.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160722227b512d---gurawiluvar.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/kepetesenujuwupunapere.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/wonafoxuzukorejig.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/gaxibowikifujosafazonoti.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/341d056e47ae3508ba5b0e2497e3de78/mojaz.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/ratobobewuwum.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/20860457389.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fdbb36286---dejudomalarinoxogef.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/c33432d7652b9d64ecdb877c4ae72bfa/ganob.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/jetubikix.pdfIn PDF document text
    • https://artenika.pl/fck/file/11596130500.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/d0e42b0973a6821cbdcbb6fb88ea3417/31683107941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=nitro+pdf+pro+crack+keygenPDF link annotation
    • 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_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 18308 bytes
SHA-256: 1bd5df9c1d21990038c119bf59d5d6eb1f91908dbcbb268c2823e67089fb8231
font_01_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 10764 bytes
SHA-256: 245751583c38f74c3cf215ff5528ec1c2211213909078b54de1af63528d8f6b0
font_02_sfnt_off0001216b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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