Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba7d5bd6595e4a0…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 06:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dffbd8e5a0f169d30c3e7aeb0bd0cf86 SHA-1: c5a4a1500c6b04e1ab16e1f5f7633dfbcd042d67 SHA-256: 3ba7d5bd6595e4a0fe5a8f4a5ba5eab88297e71f0ede35082840ff4e9c05ed14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF 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 to redirect users to phishing sites or download further malware. The structure suggests a link farm designed to obscure the ultimate destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/68bd18b5efc677f49c823e660c8abbd2/9645278330.pdf In PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/3fd5d17ae7880615bf74dcac35a36815/66585068354.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/58006959232.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/01ppr1kim0kdfch7bg3t0lktl3/34320091604.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/060327446812.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210829145331.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/701347266.pdfIn PDF document text
    • http://synowka.pl/galeria/file/kozupetogoxazebopuninasup.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed11d4001---64676629265.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/88761848898.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4993fd25596f3dfbe36cc93079cfb795/fotixex.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/savipejukizupune.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fataxavadutumisijabuwab.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/26168102407.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121c21246d9e---83142810537.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/bitafilonuru.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ss6g9bh1c5ullpidk6n1t85al6/lasox.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/66934432221.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/23404155085.pdfIn PDF document text
    • http://poultech.net/d/files/68476552466.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a0988aff1823e9076d185c3c0835847d/nesiwufisidinuboxat.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/sofomef.pdfIn PDF document text
    • https://actorconseil.com/files/file/99045727921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=conditionals+fun+worksheetsPDF 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://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_off0000d7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 10760 bytes
SHA-256: 6d32eddef68b3462ef7846d9666de66e8e6197bee414ae570a08ec0ccc3e181e
font_02_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 17060 bytes
SHA-256: ec78f5574ebe06387e5f24f4f8e382f059fea82aa38cfb43c36ec9b067df531c