Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8c9684dcfd591a…

MALICIOUS

PDF

69.0 KB Created: 2021-09-19 12:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb160c22b1d139434a34fa88d68aa27e SHA-1: 311047d9fd40d25a66bee5d0aa5be90a700f3802 SHA-256: bb8c9684dcfd591adc903ef8e3ee67ef64b83e17275a0b0706e60aee4477b729
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and embedded clickable links. Multiple heuristics indicate it's a link farm hosted on potentially compromised or disposable domains, designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to download a second-stage payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://gruppocaminiti.it/userfiles/files/72597271026.pdf In PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/6113126466.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/11831256560.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b18ceb864---16341397954.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/41191019151.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/jarexovipipojugokunozorok.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/68050341231.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/24650314951.pdfIn PDF document text
    • https://senfina.top/uploads/files/62400818075.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/95767004615.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/45259018013.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613664bad4a09---11900515202.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/xadawug.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/22270344206.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16130325dc7305---joxawok.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/sunalofuve.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/58280210170.pdfIn PDF document text
    • https://yasacompany.com/upload/files/nojiwomedido.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/gunejasomafafivusakon.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/pibebinijesarezeponikasu.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/wezized.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/femavagi.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/94039706917.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109070533045502.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e06ed52ec---josozuluxudet.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090407424551.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/mofalixetinumamaxuwex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=governor+of+poker+3+apk+downloadPDF 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_off0000b387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB387 13844 bytes
SHA-256: d7b20de8e9b1994d609c2847d1ca52b547bb0ca7f2352c847279a6f84e431acc
font_01_sfnt_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 10588 bytes
SHA-256: 13ec7b62d77b70988a95f6ba2f1c24b68de30151be533b86dfc884368d2cb9bc

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