Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd33e62d86cf9b1…

MALICIOUS

PDF

73.9 KB Created: 2021-06-22 15:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2fa12e5653f1aa066d84a89201818ffc SHA-1: b67340f823f2dab1710c09a8b9a91610f676250d SHA-256: 4dd33e62d86cf9b16e1e64e510987946fac8c07f56e6b309c8b94c294551575c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090abbcaafa6---jitog.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/vj3bp2ubu597hmd66laarchqnh/juburo.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/varegovugoxagofu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607938f4acca0---52879107901.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160791c67a321c---juwovabikututupusopon.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021060304520573499.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/90905078779.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607657cb77d62---jozebizizagav.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f2df138bb---83701194875.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf82e8dcac---tenuzofafinifefo.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/6886613192.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/84465936760.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/43f0ac4173b334fdb841d164b073fc3b/9269459075.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bb4ed1f5c---buwisiroraremulab.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ffcc3cca2ba78920f6afb8e352fb4137/genom.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/3i6d9bpee33p62d101gf1nihjq/30930071030.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/52397731721.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c09546cba---xexezonefosaxobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=recombinant+dna+genes+and+genomes+a+short+course+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_off0000c95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95D 6744 bytes
SHA-256: 0570cf1ecec75beb65df1bf6d609046d195369694cc97decd39492b8b973d803
font_01_sfnt_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 5684 bytes
SHA-256: f65d21814541f84823c8bdc7d75dc031190700eda3403f76b3897e9014ab15f6
font_02_sfnt_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 11120 bytes
SHA-256: d7c28e6b1f926a4c1d3468b3132131d2fb30a7a89be677288e582e3b7c1a7852

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