Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede7eb58b098f556…

MALICIOUS

PDF

92.9 KB Created: 2021-09-06 12:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ac44865e8de105d6158a62f4db8945a8 SHA-1: 4f6e21f4d67e2de4fff6a5036ed1bd7f6e0190ef SHA-256: ede7eb58b098f5564cf05d19b64f8b13b47752210d96f85612db833195d4aa6c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, with the latter detecting it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the nature of the detection strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f15ec1aed---43802921696.pdf In PDF document text
    • http://skincarebylaura.com/clients/862251/File/netedivekepurebafafeteko.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/42f7879a7b87577f484e47ff54a74b70/19827860967.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/jegikowifujota.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed629e3435f---zividitoxakafukena.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/78497376511.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/36611349707.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/43d8e59d86de2b09d4a9b7b3300612cb/busiwanadivun.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/lufopu.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/85283784676.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/92556177575.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/t0ethd67krfcke9i40ml2a19rr/zafopinize.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/vuwumoze.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/65716490729.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3f806afd---ruramezulejewafituripumu.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/8fe5f7b6cc2660f90af52ce1712c064f/ruwomad.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/b9p3vk6mrbh95l6ij83dgpalv4/musojibarunobamisedep.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075dbe97d7d0---vegerinexoridabip.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/74930889204.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb6781295---85115462834.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/6176988485.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/fewimafevusizutojafolape.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/nejezuxav.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9acfe404e---rorusodala.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/44128651413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=histologia+humana+libros+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_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 18812 bytes
SHA-256: 3ac6948b15bb0d8e1813855697e8174df6d35763124bb4198f7499806fc02a05
font_02_sfnt_off00014d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D13 11044 bytes
SHA-256: 7c52ac738c115199538f8c2a8019561e0e6bc895b6856f974725bcc68bb307a7