Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ecb0b1921821f2…

MALICIOUS

PDF

73.3 KB Created: 2021-06-24 07:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 60c28aa6cdb69682cd2519c88cb02438 SHA-1: 10b913a8b0ce5d159a0bcae09fc91cefd089b5e0 SHA-256: 53ecb0b1921821f291b9f41952d3177b2b5c32f0cf48e3ae340782cb94ec0a54
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to obscure malicious destinations. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are new payment instructions, a common phishing tactic. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://kiuruvedenlukio.fi/tiedostot/file/setifesiwozidatoxazujitek.pdf In PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841d2a1c807---zifedidi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p9ub5jpufi9i00888onjfeorq3/todox.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/13536375236.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081a89225345---28706372648.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9877daf8---54025690801.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/volez.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/79402874548.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/i3uoljnbptki9sfje6nf28unf5/fetifabifemipejimurefom.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/xifaxufenokofezilonejag.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e3c5b048de148f4be3f8a893de096377/13491599813.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607623da9b9f2---73923305219.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/5ab9ceff31b5ffc72b073b3c6dff79ac/38625595701.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c5e197b0c2df1eef3b6999cf2ddc263e/kokuwefatej.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/df8c0d6ee208f235218fed5a1481b422/gewitotokajabapibabew.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb0cc51d53---73085248860.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/78016427626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+energy+tesla+generator+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 5264 bytes
SHA-256: bd08faa5ba0346f7022072dc16425e7d0763f1d52a952aef860a1cb9cdc284a9
font_01_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 11168 bytes
SHA-256: 6d87c71d58e56ce9513b3da8f905f699857bb09f2471bda392d7e8cddf366c52