Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fcd53fbfee9043…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 08:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b35aa62c8f0524f854fcb343a91d7ae7 SHA-1: 60110292215c55c9b63e55bef3ddb9800671a624 SHA-256: 27fcd53fbfee90434dbfce5bf3ff7f29d03e85d5bbf3a894bce3131eb424e563
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=specimen+zero+mod+apk+god+mode PDF link annotation
    • http://redigonda.it/userfiles/files/87474052987.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/53184104435.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/11889742871.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/eabde5b6e307b04fcb4c3a24a5689468/22246089203.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/91386590928.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/xinosafaga.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139efa4cc17f---puvuka.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/tepumokurabisokoje.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138492f708b5---ruzupi.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/62764624639.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/62388364127.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131be9893079---zurazupejowoxurudegufub.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/20780427492.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/74558761342.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/4cc66050ffa9d99bf8b0604e2aabbe7c/590537222.pdfIn PDF document text
    • https://777mto.info/contents/files/32289588960.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/fafafb562a77f9e947c8cb059e36bdb9/napozoxavalodo.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d58d92387e---10468268410.pdfIn PDF document text
    • http://rem-proekt.com/f/file/depexikoxudito.pdfIn PDF document text
    • http://pasted-radio.de/web/files/zemamajunimarilisuxelum.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/1907983118.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/sukawiniri.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/45287336196.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dafe1214b---pokonaxusixulolugepawoki.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/regoposozinaruju.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_off0000b78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78B 14720 bytes
SHA-256: 72ce2862919b3f0c59157b16bd393f45efe6073281b81158ea1839563192fecf
font_01_sfnt_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 10772 bytes
SHA-256: 876d8e69d458dc422013ff4bb1037d739e057d53e7fc2b2acf4dee22a42ed1bb

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