Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1aeb28d582d8ecd…

MALICIOUS

PDF

94.3 KB Created: 2021-09-05 21:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82bcae820b6d1868e85e5f3ac3ae4cba SHA-1: 47cdb1ce258669d1821644653c39d677612f2d22 SHA-256: f1aeb28d582d8ecd9fb6c3a049c40c345a45311bb2ed257c3d080292069fabdc
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://apexnepaltravel.com/userfiles/file/xuwuluvipojunivaziputilu.pdf In PDF document text
    • http://uniqueaddress.in/crm/files/xurofefeza.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/25411121312.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/fvb7sfk9qmn89l5v6hs1pn0fq6/13610006530.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/422b2e0830363b3428b3a54feaf6485e/fetizok.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/suzivamo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/4b897a360569871526318cff76ac3da3/77064977854.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160adc8fcd39c8---32310463165.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/63063404876.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/sinelatefesawef.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/92767785917.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/22208a2226f4b6882f5dad6ed57728f4/80346249581.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dgb0ttjm1q4gj9i9di5tv9p8j2/76686486102.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1611a8430edd76---7357850755.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/wetumewofirabanupumuposi.pdfIn PDF document text
    • http://dalaichau.com/files/pigudumubogav.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/zarubewapitusi.pdfIn PDF document text
    • https://bio86.net/fichiers/kipisumokosugimabone.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/83213825952.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/kufelezumuzazobilizopu.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/57023467550.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/82007781587.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/25287819487.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a7aa7b9d9a7ffa9488d680c86440885/6432742163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=list+of+polytechnic+colleges+in+kerala+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_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 17888 bytes
SHA-256: 20c29c718a29515eae03d7719dee10f0e84df9a9a65a2a98d38ef8b1356239c0
font_02_sfnt_off000151f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F7 11064 bytes
SHA-256: 7463dc114bd22e55c18bd8995e1ad760ccafe1b5167bf92321317c76102d9a71

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