Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab969e3b823d3ec1…

MALICIOUS

PDF

96.6 KB Created: 2021-07-30 04:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 530b2ed8863e822e02085c14a4454d87 SHA-1: 970ddd6112af2a56c38c3f1df3287a4e4c132c59 SHA-256: ab969e3b823d3ec19586c82ff9dbbfe8406e22303b2d6f4605d7423c9dfbba7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=log+problems+with+solutions+pdf PDF link annotation
    • https://loctra.net/userfiles/file/86426423673.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/33466715438.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/92283975025.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/f697f895f163e70aa0e81349183ecce6/rukubeleware.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/37g1df813atk1kv2eisaqmso7f/36984247142.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/mawezuzawure.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/87899640972.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6c1d8a4fa---44250956530.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/jetagafanepifibe.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/2e7ed4357ac870fee6b888964fe43bfb/muzovofejemowusezenalo.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/1c91vn86rikpqter56r62birro/69222946753.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/83718020594.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/zozukofuwukesavo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757858746a4---fatirogujeg.pdfIn PDF document text
    • https://actorconseil.com/files/file/xiwaximewikozulukujimu.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/526ca03810333e30769b9d51620236fe/wigikexidenawupitoliwik.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tepavunejexokep.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/17e0587b4c88164c6622cf87e3e360a0/74082970254.pdfIn PDF document text
    • https://www.roadsafetyrental.com.au/application/third_party/ckfinder/userfiles/files/88640291595.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/latabaniwositoru.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/sixeweruxobusuxomumigo.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/74153709684.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc36034024d---81659920372.pdfIn PDF document text
    • http://htwy.com/upload/file/dezux.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/gurowizefusi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
font_01_sfnt_off0001112b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 18020 bytes
SHA-256: d6db7de8633038021397a9bfaf827357f84d8d83d2a2c06de45f6b1e57575e34
font_02_sfnt_off0001410a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15921 11068 bytes
SHA-256: 4788a94a34cf822648f820406005a4600d3588762ed98d9c668c788b3165df4a

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