Malicious PDF — malware analysis report

Static analysis result for SHA-256 c867dbe09ea7b5a7…

MALICIOUS

PDF

70.3 KB Created: 2021-10-02 21:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f91f99042f1d9ad02080b131f50c8bf SHA-1: 65a45f0ffba26d945f02df9c9ec2df29617f1c1d SHA-256: c867dbe09ea7b5a7cb2852fe54a3e71c2c7319203df7be25337cb40c50ba5918
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection, potentially leveraging embedded JavaScript for obfuscation or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=answer+the+internet+questions+free PDF link annotation
    • https://inverpalmas.com/aym_image/files/dedasu.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/vogutabenesefasi.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/442e09964d129586d62b55552d4a58b5/rozexowebusuwa.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a79f828f1ce99b12e19ea8ffddb7e64d/59946458446.pdfIn PDF document text
    • http://hasyo.net/files/file/famulo.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/85023389352.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/nepomibepobafabotilelixi.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/6760080915.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/jibajivivapolofa.pdfIn PDF document text
    • https://0900107678.com/upload/file/zulagosigufovobuz.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/gerepuxazimogakow.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329f4a308a2---88360031332.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f0482c528656d4cee196c3a3f5e4cdf4/48622934893.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/59611502552.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/ziwimonew.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/58574546647.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/lorosuvamubajikegezarebuj.pdfIn PDF document text
    • https://kuepancong.com/contents/files/63962896021.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/47494435612.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/27592739400.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/61572699948.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/fovetebikotudikizifo.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_off0000ae13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE13 17672 bytes
SHA-256: 6f44ff430c60d8c9e97cb57b51eeed7ff18f4e5e6d32de36ae8a8a720029f9bd
font_01_sfnt_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 10416 bytes
SHA-256: d85b8bd718d96a2d892e233159391dc149e586666957778f9d935bd33f20a153