Malicious PDF — malware analysis report

Static analysis result for SHA-256 1258bbc4d3c0c60d…

MALICIOUS

PDF

114.1 KB Created: 2021-09-04 01:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 501a24a7f768b665f4e00f11df36c574 SHA-1: 8c1d31ec5520ae345f59168e9f477d92693095d9 SHA-256: 1258bbc4d3c0c60dd9469f71f2fc8194df7e3bed0943102726b070cf7aca7991
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/84aklh3hfr7vibae72u8edgtt3/gogibolubel.pdf In PDF document text
    • https://ajitcoatings.com/uploads/voloru.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6354d7dea---51158651814.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/ladutirol.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0eaec9bb132076680cb57fc67908d9a4/migofuwom.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/bajedikabetiduzezetakenov.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/remebirajelo.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ff02d9265972a1bd040a30b415679d6f/54344805378.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/pibufovajokoseku.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a29367ac2d---41451270201.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/28549905647.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/tisuguf.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a8519932415---43483934163.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/49305476936.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16108681e07782---nafifarito.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8516a3f27935908ec9b6ad74847f756c/31085344403.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/77508581161.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ses09fou4se7kk61ts4jl400ks/4977560854.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fe42c17ff59---riwomejadeve.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/22482986180.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e6d8d9b9---xekikuzetajovire.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e0c94d4761f5818a8959c721c5cf65b0/kunasaserozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=form+one+agriculture+schemes+of+work+pdfPDF 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_off000159c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C8 11324 bytes
SHA-256: 57aa12a44eea0a2d2d6ba8964a6a9b6d95e5112156290c8239fcd7bb10afaf4d
font_01_sfnt_off00017414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17414 17956 bytes
SHA-256: 86e38f051f12901c23c289be5eb7cb2bc5e8973ec05f2a7eda43742fcb615b2b
font_02_sfnt_off0001a27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A27A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1