Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64b16061fa1994c…

MALICIOUS

PDF

78.6 KB Created: 2021-08-16 01:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a9aceafec7a5855e646d9f28a9e77813 SHA-1: 7a86e4bae4ea644c372e3f9f422fddcdf770d1f0 SHA-256: e64b16061fa1994c847b4d7dc5c0eeda879dad64478aa62125452da0c6859ca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf5cecbe5f---watav.pdf In PDF document text
    • http://stromzeleny.cz/file/zefekaxivatizowu.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/20555834165.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/puxexobajirafoxedero.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/97458828973.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/nelisipobosemagijojogese.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bcc58cd96---30172954931.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/fidopudur.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qfroj08j2cro8u7k94j5ps986n/55857224989.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/21293926964.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a302b3af2---pobizumelibomeguvu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f753ca8cac---lalowilevuvuweviveginuvav.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9851ad09---jajivimikinejaxafamazu.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/86528636355.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/68399513322.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/dazefitebojeju.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f851f390---11664414336.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d37014022---22929502837.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/67c80bf02e191ff4a8e75980da1cb7d7/20616325911.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/wexom.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/965bbc6b50f31d004c7553ff567f2b1f/metekibuso.pdfIn PDF document text
    • https://anaksemut.com/contents//files/26260833089.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1fec53507---dilisavalunuvujanapadura.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/91878246926.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607394fc1f0bb---bemelesesebikibiwuluviko.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/zabaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=livro+fundamentos+de+enfermagem+potter+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://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_off0000c951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC951 19660 bytes
SHA-256: 05a651b2ce9b12a8e5a2dc2efe9808819a0c2242ae15159ade9852b7c036e9c9
font_01_sfnt_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 10920 bytes
SHA-256: 32e39ff9874ddf213d63e547a0fa35a733ab17864174db48a5ed3c29b7adb8a4

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