Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0d72215d0e62bf…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 23:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5eada18fd0cd57cd2cefc7c41f47934f SHA-1: 7f0c2bd30aaad690047229b2751825de207d964d SHA-256: ea0d72215d0e62bf59ef664aac16d01bf905251abe5b70ac49ca9ac43ac38194
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. These URLs are likely intended to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://infrive.ru/uplcv?utm_term=suntan+2016+torrent PDF link annotation
    • http://dr-temt.ru/images/file/82942760759.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/toniwavusemutoriwapuj.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/7074323468.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/06ba5f51380e89f3b052b049f4ba59cc/zuzutisonilagelovozabe.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/zelulelupavad.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/mezosofowi.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/pikexel.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a926358c2---jagidiriminotejajapaz.pdfIn PDF document text
    • https://fishboat.hr/files/76441054810.pdfIn PDF document text
    • https://nomortiga.com/contents/files/17534347746.pdfIn PDF document text
    • https://thehouseproduction.net/file/15201605298.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/53641200958.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/77038542306.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/wiwetajuxazo.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/65244445819.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/zekokabuza.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/923c8e0f125dd8bc496ac01e937f5bc7/29383145361.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbc8dd5052---1235626163.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/35575628682.pdfIn PDF document text
    • https://tablouri.emilianchirila.ro/imagini/files/26228896999.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/72281075162.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/dewaforoserovalex.pdfIn PDF document text
    • 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_off0000ad7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7A 16292 bytes
SHA-256: ada26151f6c6c83ad681eea8d8354124fa298d3b80c321d101641edd5a7f4676
font_01_sfnt_off0000d6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 10432 bytes
SHA-256: 0b0a86ecb6dc379a23a7eb81b51308e809241cbae0410c7685cc04c545a6f3cb