Malicious PDF — malware analysis report

Static analysis result for SHA-256 467a6d1fd93e8c6f…

MALICIOUS

PDF

86.1 KB Created: 2021-09-22 09:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d53d3fd838f273650aba639df46245f3 SHA-1: fa408772b5570036e62aa534bd9e2702cdeba2b6 SHA-256: 467a6d1fd93e8c6fc8a773c6d3cf9b9d398ae5660f7a74f5dd0eb1a8cc9729e2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting. The primary attack pattern involves directing users to external sites, likely for phishing or to download further malicious content.

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 https://wastran.ru/uplcv?utm_term=how+do+you+do+a+hard+reset+on+an+android+phone PDF link annotation
    • http://ebsenglish.net/_UploadFile/Images/file/lujulapizonixugimi.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/66825038259.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/vivukovesarifizi.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/dulub.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aca1e8fb38---dovibifebuxupujux.pdfIn PDF document text
    • http://www.juthamasclinic.com/upload/finder/files/nudud.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/87887643215.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/wowamufele.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/derozezajiludot.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21d578e8f---42816508168.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/49751176369.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/78513889351.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rgd1dvf81se3dj2h3kr62a7bt6/resimar.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109110636044774.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/56815387687.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/mupadenibuwemusitujixux.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/wilunebiro.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/28991970338.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/nexizazopazerifapomikawib.pdfIn PDF document text
    • http://synfarm.com/upload/files/11128035471.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/40612160175.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/rarelibijejasaleg.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/teninisizetim.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/megapiwodugifune.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/r7dgc660goc4s0vlsbjkm5hm1q/60961796345.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_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 17832 bytes
SHA-256: ada83ab61fd9549514cac79cda1419b9a598b316cb84cbb405113dd6e06549bd
font_01_sfnt_off0001198a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198A 10732 bytes
SHA-256: b44a8bad159cd087374bf5b0910997bf4be32fef13a82ce33b5b851c3b5e94f5
font_02_sfnt_off00013236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1