Malicious PDF — malware analysis report

Static analysis result for SHA-256 6274effd5fac61b1…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 03:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf22dc82a0216beab3e14a7e0c7dba32 SHA-1: 7492c7a3cbb05645954db7e1f4bf4f94f5e31237 SHA-256: 6274effd5fac61b1c5b0c835564ec4d1374568961e45acfc6ae9c462049dc1de
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

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 https://air-separation-supplier.com/d/files/risoxusokuxuju.pdf In PDF document text
    • http://bobas24.pl/Upload/file/webepimetaratanexa.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/94274562504.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/wegatiribula.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/65227267818.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/96979200442.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/494th6v658ercn74bvjmg5ofk1/77027861494.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/somirozikamuson.pdfIn PDF document text
    • https://rotherelectric.com/files/57718826052.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/vameg.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc34b1718e---60789314754.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/lobiwimelamuzimajaxaraz.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/91508716889.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093a816216af---kejejadagi.pdfIn PDF document text
    • http://unseretochter.ch/images/file/22218001454.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161170a112c901---14930698558.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/gelarasewisa.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1e2c9fc44---2235418316.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf9fdc342e---2468531241.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1mbp1hoaacpred6vaneij8bmkp/rudivitejafuzepo.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c0c9dc63a---misunivinoriziv.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d496dcbee87---10087080041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=marxist+legal+theoryPDF 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_off0000d289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD289 17044 bytes
SHA-256: 5a53adc159c24ecf328e772e992bac55b9391a7e55c7f40133395696b5f2eabe
font_01_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 10492 bytes
SHA-256: 8937c24fe9d2b23d526ee4030f95ad80379a2ddf59bf1f859b9375fd369d58de
font_02_sfnt_off0001166d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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