Malicious PDF — malware analysis report

Static analysis result for SHA-256 503c084a31c2f3b0…

MALICIOUS

PDF

72.6 KB Created: 2021-09-07 18:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 45555f116c3a5113f6d3275879fc743b SHA-1: d3cb170b440d2e36c987592aee80e0154107ccba SHA-256: 503c084a31c2f3b0216b8ff44bcf0b757ef7425a891bb2fb4e5c2778f53b174c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on compromised websites. The presence of multiple links to compromised CMS upload storage and disposable hosting suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://insights3.com/wp-content/plugins/super-forms/uploads/php/files/abda7fd3423020a43780ea8275e471e2/68497528695.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/d6e0d1a7b2a264c63b5191dfe82038a0/zimetuforevuzusisar.pdfIn PDF document text
    • https://2winit.com/Files/files/26088823311.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/d6ebbe06e437cb41970182144890bf8b/54787614046.pdfIn PDF document text
    • https://jagominum.com/contents//files/gunedudo.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/60047453038.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/37425404185.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/55724690122.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/pifasopusa.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/56d53b0b5a60c604945cb77bdba69f4d/doxodoponitavibib.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/mebupi.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/8708159697.pdfIn PDF document text
    • https://longhoang.vn/upload/files/fimidoso.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/jesoxibeju.pdfIn PDF document text
    • http://bankerz.in/qpic/files/vimizixagi.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/11609797989.pdfIn PDF document text
    • http://fteq.ru/files/file/77896508191.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcc3aca445---88612964432.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e466b471b0---57883379815.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d2e410e62---tatobuvape.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/kujovapowuzexug.pdfIn PDF document text
    • https://mfdesign.hu/files/file/64052508372.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/kopixeseradetamuwagosive.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/maberojurob.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/6803875134.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/sazujuwororagupazanedixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=roomba+780+manual+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_off0000b8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D8 10568 bytes
SHA-256: eb93c1623db089c3f03d1f72c4ae5d6f0a6f6302e653a6ce6520cf7f5caab355
font_01_sfnt_off0000d0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 17476 bytes
SHA-256: 1e6a6a9c2c270cf5260fc7d95fe38c5cfaa27975c489eea06eccc237b4a9c37c