Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abfc20697f02ea0…

MALICIOUS

PDF

75.0 KB Created: 2021-08-30 04:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7744bde5ce99141b8dda368d355e475 SHA-1: c08417baa83ae9726fe121cd99dad5d3a1cbf1be SHA-256: 8abfc20697f02ea0247b179b1a4339a78980241f63108d8b1e92b21b3f3563f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external PDF files, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates a likely attempt to lure users into downloading further malicious payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pixomot.ru/uplcv?utm_term=how+to+add+a+sticky+note+to+a+pdf PDF link annotation
    • https://faprosid.com/file/50664938435.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/jc06rvjff50pvpdak381qga3r2/kibubifevevifelarit.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210607081331.pdfIn PDF document text
    • https://go2germany.ru/files/file/fovowuwewatoziwubo.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/xuwamerokakapo.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba32b37a99b---zegezusemozu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qelma78chh8n3umljuje7sgplb/lulutujulowamunapuve.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/50752009421.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/50724982961.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/xugakosuvumuresugobew.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/72fcf36fe3991a632a177aff90fa12e1/surubipafidibi.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202108211942307629.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e3d2e9dd8---pukiwovuxazaparisizoxibex.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/tufejabulif.pdfIn PDF document text
    • https://wecareprogram.org/images/file/fidekexafalokere.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092385dcdbfd---kiwewonuwenemoxe.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/gukisalorodup.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/88151612284.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/rudunededixurujalazow.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0v855bkf540pn8hjjuis797iaj/xasawagunozexevekoni.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210716132426_139450550.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/9993001645.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 10748 bytes
SHA-256: 1e5d001ac08463310006cbcef3528d1d8f9f3139efbe0306b8fc07b82ee9228d
font_02_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 16888 bytes
SHA-256: dfd95f330eaa011b537f750e5a1a083b94f6bdbfbeb2f5612d7acf6a86703d74

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