Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef766e84dc30e312…

MALICIOUS

PDF

107.8 KB Created: 2021-06-06 06:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a6f9fd804403f2b0323087f5870f61c6 SHA-1: 8052ca14ab26e6fde422613195162f00e9477c7b SHA-256: ef766e84dc30e312db37544ac14aafe10d791a53f1f959c69daa573188a8e89b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a link farm and the ML classifier's high confidence score indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=working+with+emotional+intelligence+daniel+goleman+ebook+free+download PDF link annotation
    • http://pechati-piter.ru/userfiles/file/xinusorirezuxulamasin.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rf46nh1a2u3i05gvfnsc9867mo/68961097751.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/946941489d0699a763ac56346cc54fc0/xuvasikiwanataf.pdfIn PDF document text
    • https://actorconseil.com/files/file/febamubuwero.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088086ce131f---63451523618.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a38f96bdf9---metomuxul.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160779310bee76---lomunixodatuviligitew.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087bad68e6fa---wogujefosemubametep.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/98749158775.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10abce287---1528289047.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4fosc0238eg4l5mo3uhmlel7ag/fefaduvuvixusod.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/4e4mi1gvj57rem3ijpdetkfnv1/91489541805.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/sogazorukovopuwuguv.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc0be59fb---sogogoweboxaketanesopawo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/64078bb18b16d8506e89f37d61cc5bdf/gigolowadapubopikad.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7769f2af26---gazugi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A1F 5356 bytes
SHA-256: dad3bb48559ed058e43d6c1518d69778b68ef006b21db21f0c631bd8f3e93e17
font_01_sfnt_off00016c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C3C 10912 bytes
SHA-256: f279550e380f80f89096ff0f8314ca9661032a71a66ed150218f6b81ecaefaed
font_02_sfnt_off00019150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19150 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378