Malicious PDF — malware analysis report

Static analysis result for SHA-256 284d8529423c8331…

MALICIOUS

PDF

77.4 KB Created: 2021-06-24 17:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2a5288953b35fccb4b79ff776a062573 SHA-1: 380ab66ab064edfc19c554fb84ef3382c1e0dffe SHA-256: 284d8529423c83314d5cd2e826067fe80b6b954b8a47bf36e732d38962b94d7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it is a link farm, with many URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, includes a title that appears to be a lure, and the embedded URLs are the primary mechanism for delivering the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fosexofasowupepubabezoguj.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/iur6ljuvbsl2m3cruoikptth55/teviden.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aafa174413---degifamefudanizudixexapi.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6f8829218---fotonunabokobilete.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802dd737ecb---mobimulojupikitufa.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/58223255.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d8e5e64db---kijoma.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cff4029cf---22117081782.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sufuzokoto.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fdace0c19---95061110556.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bupivedakuz.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/efae36be8ffea70908e1507b7403e452/65127868112.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210601052339.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/giginanofemewumanogaluwu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/lp810uht528dtk41ie1g76hq67/22591691833.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/562a938c5f16801a05b66f7ec6f10cdd/gazokosirezifuzifixefeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=there+is+no+frigate+like+a+book+explanation+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE318 5312 bytes
SHA-256: dbe626a79333406fd9fd3e4d3405ab022359e3e31c30e2b2a540130aa996acb5
font_01_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 10204 bytes
SHA-256: 860b2feaebaa681998c1549b47d0719245f7d82293db222b6a8298bd4987c8f4
font_02_sfnt_off000117f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3