Malicious PDF — malware analysis report

Static analysis result for SHA-256 0345d462e6680a64…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 10:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0281f51ab05afb34120696152cc6440c SHA-1: 4da7275bf825b4c6220111eb9ee937f294bf57ea SHA-256: 0345d462e6680a64a05c92c459c0239330c4ffe637869fc48a40476af2460416
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://xetnghiemadndanang.com/upload/userfiles/files/15120284962.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090762c1cefd---pizogagabuvitovikoxarefi.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/labiduvixezosuwutigako.pdfIn PDF document text
    • http://chieucoingason.vn/files/xilejebuxuguzuve.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210826103842.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/nevavebava.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/58262674719.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/24240114465.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e6898d95a---52145517718.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/xaloduduz.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/wizekikepugolizupod.pdfIn PDF document text
    • http://dzbnf.com/upload/file///fulakubakupodalowe.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/0af0859ef57da3f4978d0dbe344d488b/77061789776.pdfIn PDF document text
    • http://haphadoor.com/upload/files/bejam.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/74180788231.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b4f148043---jokedu.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19f2d9ca8d---jiwosow.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a3364f6d8aa454263125ee91d1322f0/11037290806.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/kofelonidevavawexase.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/nolivamitaxob.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/22034668450.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/41285812244.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/r8drc5h1avn8u3mcd0q30ijrms/xojusivizi.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/62005512935.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/81390660484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=find+the+surface+area+of+the+right+conePDF 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_off0000deee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 10784 bytes
SHA-256: f20230d9221ccc29be73964f0d02e70e037cd5939e21bbbac034297de312fe80
font_01_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 18492 bytes
SHA-256: 82be82c7a86a0af0837ce75f2083c14fb79248c919aac0d3da034b62b8d76a9c
font_02_sfnt_off00012758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1