Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8a719bef69b5de…

MALICIOUS

PDF

78.6 KB Created: 2021-09-11 06:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5236c3b96d858be10f4ff2b7b6c02892 SHA-1: b809fe545952ee6e2d935a23a868880b89d67a54 SHA-256: ab8a719bef69b5decc6ad3753bddd8e02301a2a196799ec27f71039b52eec86c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://huntic.ru/uplcv?utm_term=ps4+official+android+apk PDF link annotation
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136410dd287c---fidaf.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/rolol.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/cbb76d44ca821fb2d88604800bdce55e/5927894097.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/mosexoxubojokigaxasu.pdfIn PDF document text
    • http://lagrupacio.cat/file/pasatojelupegozazoxitaji.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/foxubire.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/072305068056.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/tagozigaso.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/lutufowejukis.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/8900156046.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109080132153675.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/gibapoziturokopidizutiv.pdfIn PDF document text
    • http://servmed.net/userfiles/file/62003526958.pdfIn PDF document text
    • http://xsteelstock.com/d/files/wivamese.pdfIn PDF document text
    • https://sealskinz.ru/files/file/12429208700.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1aa0a1ebc---85845227881.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/57970086050.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/tiruvibaruwizuzigiviranin.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/sarugaxo.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/36968390135.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/zifaloso.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-2/20210902065059545941.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/28276128182.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_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 15664 bytes
SHA-256: 0d2e575b1bd166f30ac975223617188b64b8b77b4a8c5a0a5e4304c57436f89a
font_01_sfnt_off0000fd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD47 10556 bytes
SHA-256: ff7ee99bc057164ce41f65770bf607faa34fd1588f436a284d91321011748afc
font_02_sfnt_off00011576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1