Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0e67570e6ad9b2…

MALICIOUS

PDF

103.0 KB Created: 2021-06-25 08:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c59291eb85af054abdb8df606e9625a8 SHA-1: c6a2cbd9574ce250fbed9defdbb3ec355f37651d SHA-256: 1a0e67570e6ad9b28285fdc76f42fc2c2781ae768e60591c4612b762641dd776
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/vjct1ba89pof67a9uk72745ra6/79784113188.pdf In PDF document text
    • http://sequirk.ie/userfiles/file/81066743188.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a16b078d078---54002975847.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/e8c5cbcd0f611ff1c1a0f9c344b777d2/39679933210.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/59727148130.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/wowigekogeluwonevezizumuv.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608521a30c0cb---pozokaf.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16090bab228e6b---vosovudukopebemovirisixig.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c286b56e6---55009594114.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/nafulevivudewavatizoru.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/61621734744.pdfIn PDF document text
    • http://kasargod.net/uploads/file/josakolelepo.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/176243547460a8a45239431.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6db26d7af670546f62465b8da359f9d4/fevoziwe.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a94bd9969---61194757916.pdfIn PDF document text
    • https://egf.tw/test2/images/file/79545943045.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=la+derivada+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
    • 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_off00013859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13859 4828 bytes
SHA-256: 230c86df7eca869ebe47fbc520c45e5083c3b6ffe918bd6830c1f1c7d12773d9
font_01_sfnt_off000148e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E1 14268 bytes
SHA-256: 239d68f7b6d78b1476406c39756620ac64614fb8131347ad932f1067f155c66e
font_02_sfnt_off000177b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177B6 16180 bytes
SHA-256: 61af11c909d7eae85fee6e13e2a972b56c56e557730bfc7021bdb3dabefe8542