Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7251e6f5c2a35e…

MALICIOUS

PDF

108.2 KB Created: 2021-07-03 20:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: df49580525bf6fb74db0c417607b72fb SHA-1: a7773a7785b66356dd33aefc6c129161b314c2d7 SHA-256: fc7251e6f5c2a35ee52d3469184eed9f675d068cc967e347bea8d0066a5d7067
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836934bdbf5---tixak.pdf In PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/f57e2f3cf126bbc8b19b49ce76d8d161/78499423904.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/cbf7531dfba27ed8b6c52450a1d9ddcf/nomojibakuwudibu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b432225f645---45584071186.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/86efc85e91aa9327fb588efd1afe4d5a/tanuwitenibuvukowapi.pdfIn PDF document text
    • https://ekransamara.ru/files/solozezavenejiwub.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da0e15fd5b---70385304309.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ep3nob0hstg1ru35m07ivg29nl/renoseb.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/58605070025.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0aad4048---45861305505.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7fd13ef040b34136e81201ea29bdde5b/murifemuxijupuvalak.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/ce328e5497835c85d0fe85cdef7c321e/25376563719.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/xegutisipuven.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076671535480---mimukituxuwuj.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/25528933290.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/27/file/20210627_062219_140.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c207784da7f---jadetanuponigasiz.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/39499231609.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/97380191815.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d57605a13d9---bixujilokeredizanitotemow.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609831a632540---70563592889.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/90637085977.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb907d3766---fuzixaxupuduzevixakij.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a29f508f8cf---34927137381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+crucible+background+informationPDF 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_off000144bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BD 11052 bytes
SHA-256: 0be2c830048bff33c4bffa9a927c52630d946de2c9c39a1307d804209328affa
font_01_sfnt_off00015e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E07 17592 bytes
SHA-256: 5826500e544e94cdfa03c3af9e4d3f66612faeec2f3b152214eeafdf0e9c11f9
font_02_sfnt_off00018b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1