Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5208e8d49f6f1f…

MALICIOUS

PDF

68.8 KB Created: 2021-09-07 20:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9cca9c22080f9291da14b8caebda78c9 SHA-1: 85f2b8ac9653082421a50311cdf512ac21c9753a SHA-256: cf5208e8d49f6f1f4e00fd1c7ff2d737c97d7fc1fe88bf0878828a13247bb7f0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as a phishing lure due to its structure, which contains minimal text and relies on embedded links. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external links, many hosted on compromised WordPress sites, suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5160b8ad3ab01a1d8b8024af9575176d/lapabetufusowilewaxudalor.pdf In PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/56fd26a9ecb1f393385cfaea2d966442/gevas.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/dikowimugepalikarirete.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/e81jlbl809iti8f1efvat183gq/64757174503.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/bogupuvol.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/miwoxuwezewe.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/40695972632.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab125619640---8947564959.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/49843d3293dfb346c4eb9355c0fd2694/13355029542.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/v9k6tugbmvp3n0aajrfia7h3v5/52226675252.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c47354565---dewitavisuviwa.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/28416258020.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094061b6bea7---xoronivufibuxik.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/9725416459.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/xipepuvubuvasalipimevado.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/kuwuzubegusisivib.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/74738986933.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/1c5e345eefcf939b865aaeb6c7987dce/felofinogat.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/tixedikurogipiwisafimudiz.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/68458807917.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d03fea430---buwemogisavakuxe.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/28853923725.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4766e0548---54422208042.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/rarunifa.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/1182858186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=differentiation+all+formulas+pdf+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_off0000b1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F7 13824 bytes
SHA-256: 81675e35aa0f1d674958689bbaa439ff5f9ded495ad60cb4b5458a5d44d1c103
font_01_sfnt_off0000d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 10848 bytes
SHA-256: d69124f2a540a5a0ae48c190b6fe60c0fb8bd25dbac80175bba47917eb169480
font_02_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1