Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49a39bf93ed40a8…

MALICIOUS

PDF

86.5 KB Created: 2021-06-20 15:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9312c1f362010e6f5a4c460519b879fc SHA-1: fc39eadaab9fa65f8e17ec3c21c8c3f1bbd894fd SHA-256: e49a39bf93ed40a854ba39dfa899bb3c21f157bcf7c2e3b3f468af889c9d537d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f701907dfe---64314665995.pdf In PDF document text
    • http://lapenya.cat/imgjovesnaves/file/gotowavavofavaxoxatudiw.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c0fa80e30---bapugis.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/33019032699.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/50921823894.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/eff1ce130681a33496392ee9a2b46e2d/megutojafowewoga.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bf4baed96---81247662158.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4ce9482c---sapuw.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/9718014025.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/4459088216.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a84c45832d2---vutoxelofirepe.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/pj5idaqqfrd28am7v9h9ja8be1/45523021309.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/65973422121.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/42772626613.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/91748518491.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fe395a314e2080add662bb42c06a6fff/20302048419.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160911cb7e390b---gizabubuledafisovigazuse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=skyrim+enhanced+cameraPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001121d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121D 5240 bytes
SHA-256: 1528ba343ef1e06b95c2d2c7e34c0bc9fafe4f4388b8cbe2c4d6890dd2527380
font_01_sfnt_off000123c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C9 12012 bytes
SHA-256: 5f327e055e7e4e090e342fabef9a2f179af745b0c18d2a4d23d54a466253fa8c