Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3467fc5cff3b5b…

MALICIOUS

PDF

74.8 KB Created: 2021-05-30 03:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c39d11c90efff70bb5fba96d7cd4f09 SHA-1: 549daf693385f3afc230d3bb8a75c47cc9b39b16 SHA-256: de3467fc5cff3b5b57c9f3d3ab34c30f0dacabee55f9219ab339e908b99b53c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to disposable hosting and compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094bca8f0857---puzamogafezupiliginuwelis.pdf
    • https://travelsafeway.com/userfiles/file/terataxiseterigugana.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/gugowib.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf84562923---54019300959.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4ca76a17156c5278787f62b251e0464f/fifesijuguziwiporelajatan.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430132623807474.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37c17256f---zogegineb.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084159c0c58d---zelir.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/obfgf485nhvafscfgqvh7ejnbi/22865747449.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4361a853ab---zefotajurepovazemazuviwi.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5b2a224a---87895459872.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/lh1gjvdog4oijavv4n284pjbso/voxoderowujedezagavow.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57d29b3a4---40496829073.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074d48077479---25845427000.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078cd14478ca---66535130413.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/3539d607d5a9b57196254bfe1e20f286/bagudimirefufudojoxumet.pdf
    • http://citra.cl/userfiles/file/kaxafomoxix.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce1af4b1ae---93214120896.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=libro+el+abogado+del+diablo+morris+west
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6cb.bin
484bef695a722dbdfcea5ca47aef2ef3f6da37e8e80e4382c88012c976ca4f16
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CB 5316 bytes
font_01_sfnt_off0000f8d7.bin
f8b6ae7820518b775888ad1a4d2056208a2fb2b2807964cf4b454934feb0772a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 10912 bytes