Malicious PDF — malware analysis report

Static analysis result for SHA-256 c319b8587fb2c892…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 11:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e8dbe895620f1ed213bbe0889d98c01 SHA-1: c0cf29c1b2ec28e838418723c48ffcba3ae1189f SHA-256: c319b8587fb2c892c4a4e4c0edcb02b9a2cd7ef96e36e230c94dd9799facfb10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm, directing users to multiple URLs hosted on compromised WordPress sites. This is a common technique for distributing phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5401dc6cd240d38f31cadbffd43da6a0/retugaluxiwifobe.pdf In PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/f3067c9b192e9f03a9c8648de779bd74/52393128401.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/65652707922.pdfIn PDF document text
    • https://4appsoftware.it/file/96790274011.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/49406389882.pdfIn PDF document text
    • http://gestmase.com/media/images/file/kekedixufaf.pdfIn PDF document text
    • http://geotersrl.it/file/lifale.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/90852019126.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/53457818434.pdfIn PDF document text
    • http://atek-ent.com/upload/file/97295450661.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/buwosanegaximuse.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/mesivigabisekirivawur.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/99042612904.pdfIn PDF document text
    • https://atavio.ru/files/file/nibarawaladasa.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d536ffeb4607aa55236f74fdb9387655/14151284251.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/912c7cd7c6dcf2671400492139d29ab5/vanorifusa.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/132jv14n6tn7qo6ov0e52uc7dl/votinelusap.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/93977654935.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608c09f447397---vuwamurixunabizok.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16119c53f1bd22---51157490742.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/64609269324.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/92346697798.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/pufumow.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/30622176765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=year+4+english+worksheets+pdf+ukPDF 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_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 11116 bytes
SHA-256: e16e095f0ec7bf854f4fa31a9866a9373dcfe0f585e41f0b58d206fba34cf0d3
font_01_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 17056 bytes
SHA-256: 1285ed93770601a19043f3d66eae06bc4eaef331ae6b26603668bea14093965a

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