Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4625593b20891e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 10:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 673fe7d68dab65d59a1f7e8bcd88c4a5 SHA-1: d73cf8c51cf609f2b9aca16c25b0b1ae1332d3ce SHA-256: ab4625593b20891edf72798f09bb3d3288e5934a0ffe4733ca0d94ce278aec4f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting. Heuristics indicate this is a link farm, with a high ML score and ClamAV detection confirming malicious intent. The primary goal appears to be directing users to external sites, likely for phishing or malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://logicamail.it/draft/media/rafidoxugemuxomexuragi.pdf In PDF document text
    • http://h-st.nl/bestanden/files/vasafusenarojudezesulopo.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/29890880827.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210921094326.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/67504429288.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/94637353073.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/papinupemi.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/golezoxanuxip.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161391d4879c13---84121852177.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/2693904562.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/difarodixu.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/28788183771.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145eaec22150---kerinabit.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/84407235224.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/51145984673.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/pekatamizazebeborim.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/dokezodufakipojezudoxu.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/pavijusatipe.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/24842551998.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/79932161995.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/68658797676.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8d711b648ad1d4401515eb084faeaecc/sudazofepepidaxapujixuxa.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396bee4c2a2---59205649270.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/vuzivoturemivulawolafim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=free+instagram+likes+on+a+postPDF 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://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_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 10664 bytes
SHA-256: 96d0620653ed106225386f54bb0f00ac47ca0866d1baa20217026de05ac2f4ba
font_01_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 17120 bytes
SHA-256: abd331b3fc8843b713962cef5f7cb7372d7e4fabf4232b97eca792ad86815813

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