Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe97a810383b3af…

MALICIOUS

PDF

94.1 KB Created: 2021-07-31 09:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d703afe00d6f5aca7368f222c6cc7bea SHA-1: cb8da0d35e67a2d9cbd251dd412027acf959a00c SHA-256: 6fe97a810383b3af66b01649a68d80538829011809af4a6049caf07041dd8ec2
136 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that prompts the user to execute a command, a common tactic for downloading and running further malicious content. While no scripts were directly extracted, the ML classifier and heuristics strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad7be6a770---42253610481.pdf In PDF document text
    • http://bluelakehomestay.com/uploads/image/files/guropogug.pdfIn PDF document text
    • https://tangentemag.com/img/file/niluti.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/36320c4js6sqh31hdrf7mef629/35456396500.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/pekemudiziro.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/kifixo.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/73661476714.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/banugazapaxajuworepibif.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/62786406033.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052805290644.pdfIn PDF document text
    • https://tepihtrava.rs//files/10446293260.pdfIn PDF document text
    • https://cristalensi.com/public/File/ravevoxukojuvenolapufoto.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d485a72c84---leronikijosexukasumogi.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/nafowigonenamet.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/21140055303.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e10b1737d---mefoxa.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/xekefilapiru.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/36073026033.pdfIn PDF document text
    • http://tipiland.net/upload/file/tukovobidifixajukedowi.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/zuvenoxa.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b475c85f10b---31727511113.pdfIn PDF document text
    • http://erictex.com/ufiles/files/91718927356.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160858ed136841---83879788718.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/hvat1l29eio1u8m12sh9ojq0q0/71530971474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=clave+de+producto+office+2013+home+premium+365PDF 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_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 11580 bytes
SHA-256: 6675194bc12b42fdb7e1e6ffca29ca3c0eb5ff7d44e8cf8650522f25c08faf2f
font_01_sfnt_off00011e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7B 18800 bytes
SHA-256: 1056ef0e5521b5ba705c702d7d930c1af9a98db8b2fc1b61880a9e6f60cf6785
font_02_sfnt_off00014f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1