Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0da7e555f8390f…

MALICIOUS

PDF

189.7 KB Created: 2021-06-23 09:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 211bd687cbe20c5400783cf097527d89 SHA-1: 04edc3932d28ab08cb72154267fefdcad7b4c794 SHA-256: aa0da7e555f8390f19839dc786154bc3a99816aa9ec9bd710a0cb7ab8b6a6959
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting it's part of a phishing or malware distribution campaign. The presence of external URIs and link farms indicates the PDF's primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ketchas.ru/uplcv?utm_term=new+english+book+for+class+9 PDF link annotation
    • https://acronimocostanzo.com/userfiles/file/lepogijirerepusav.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c78e8d0ae362b88f9e002fb1cb11440/pasobalomumezala.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/21817395809.pdfIn PDF document text
    • http://amdind.com/userfiles/file/jefowatusuxiwigitoxix.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b005e3a92768225a6c52c5eaef7cf17e/79067231826.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/21ce532ba327e4536e4a4415e991d0b5/57524328590.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/97132275370.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/75522660277.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d54b31a53---jegibaxifo.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/460020621.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/dubosixuni.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b12e58318a---rugeb.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/sovifatetagipilojidip.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/11274550342.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002a655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A655 5564 bytes
SHA-256: 76e5811dc61d84cab0225f97cd272f5134b448f42923025554c85604f95318fc
font_01_sfnt_off0002b95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B95B 16184 bytes
SHA-256: 760ae1d6a0a0ba3a80f7ee9bf8fd3236ac2a98693aae0fefc4d8742b5d6afe66

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