Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3a33201fd3ff93…

MALICIOUS

PDF

82.5 KB Created: 2021-08-14 17:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f26c928ba0d0d057ee101ea759e3d1eb SHA-1: ee3ce38f0037b9da095c8c979b328a3597696a04 SHA-256: 2c3a33201fd3ff93208a6959562e226894ffc91294aa0bc2fc4c330eee604a8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites, likely as a lure. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a0e2e109d---zonosigavi.pdf In PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hf229r2h9la0h67bu9h78529cm/powopipipegenamononix.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a4a1cc5e0e2624731c4cbbc748706178/tidaxojiles.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/buputaw.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16101125de1add---gelexamijadawite.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/44c675d3d19cf02371f75db91f45e900/70107678205.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609305f20a8c1---loserunotamagoto.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/fm1e607t3c9k4nmbj30vkf7khd/96531050414.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609570c51038d---tepefuvonegipedesifo.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210727154320.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/837004078d112001406938773dd558b3/xemoxuduwu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/m4fca321pbo9gd4rm2at392ljl/85342956056.pdfIn PDF document text
    • https://digireg.dk/upload/33987999551.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/12650202709.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/dagupuj.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/47510768819.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc095b5776---bufanomenoxexusemuse.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/81072935079.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hjll6urbfn3m5bq5o0oedcf125/rejotupexotaz.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a8d9959d067e8e0a5891245ae9785259/papuredotelitujofadapid.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/78746252103.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/rozebafakuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+many+syllables+worksheet+kindergartenPDF 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_off0000ddb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 17188 bytes
SHA-256: ec73f10ae30cdd3fe6dd7302e6590fe91dae07fd4a9a17dd90015aba8e96a51d
font_01_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 11120 bytes
SHA-256: 64cf264e6df12f60f27f839aa94e4b6a725ca572da434f0d7c845a26b38d906d

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