Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b63bec55b877c40…

MALICIOUS

PDF

74.7 KB Created: 2021-06-24 08:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 97eac08994b53a14c49d3cf2c5dc63ee SHA-1: 5c4c06361990a7644754855e95f1376d3682cf44 SHA-256: 1b63bec55b877c40937f775f5806ffd26527a605f1ad88ce82fdd912e8eb9495
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF likely serving as a lure to download further malware. Although no scripts were directly extracted, the heuristic firings point to a phishing or scam campaign leveraging compromised infrastructure.

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://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/115f66d00928aa9ef4161222bbe6cad2/24239794766.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b637a017551---vifedoto.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/vevijadupabesila.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3258199c8---peralojisajexatisunavot.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/ff3e4d8969f4ab6b0133ce41079f1c13/fejonumavigopibuwa.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/malitawofumupagebesawumij.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac41c2e2e9---64315749730.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/sukizulolelata.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55d05c3be---juxovojidatosa.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/cobo9ofnpuju8h1p82h68j2c13/67009890110.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/60b24f5u66e159urn5m9jna4n4/11778421447.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b8dbb4c25---88453251947.pdfIn PDF document text
    • https://85097781.com/upload/files/83176751595.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25c0f63424---xolibufifufazimiwibu.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/disawapitalejixisegat.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/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=quien+se+comio+mi+queso+libro+pdfPDF 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_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 5420 bytes
SHA-256: d24a29cda52f7d6632d70a7d64169b94c081ec4b607d8ee0bf21f8291fd2e33a
font_01_sfnt_off0000f688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 11580 bytes
SHA-256: e9c58f2d694b2156c42eef4555e15f37f921d5cfc1f489ff636fd26f8305ce44