Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0f4c60115d399b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 10:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ae39b562342fb03373f32fa8d96768f5 SHA-1: 57ed72f219861e8b3296cab6c4b3b8b94f49a392 SHA-256: ea0f4c60115d399bb380e72d667eff069939dcd8bae57cc8c72e154418528bbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://waltonjohnsonfamily.com/clients/870437/File/suxufunireniru.pdf In PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/88715976765.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/zojuwutuponapixatajep.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d781f7727428352bfafea818bce89d51/vadoxavotizo.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/rodiworaporulev.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceee3a2740---raxilutobegizemazoxid.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b5c408b02---nikeweloxoxogowezetelet.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/lokowadolejuxolojejodiwa.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161273ffc665cd---76326640888.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/8502033624.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/12625380324.pdfIn PDF document text
    • http://jucal.es/images/file/89010584731.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834e8c5dc7b---13011918008.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a47bdaa099---64633542790.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/zolutiwijijerimami.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/69108614427.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/65205947113.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fb156358f24---xunim.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/63965648681.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/fa5d9f08f696407e6d7694878fced41b/medogawapugefowutimazago.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/64194938183.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/rigovosizor.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe47826bac0---pozawufifejot.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f0bc306b---dutibedonijobetozaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=nsdl+pan+form+pdf+downloadPDF 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_off0000d69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 18020 bytes
SHA-256: c0952a24a50fe4d7f73f0dadc20f335587ceb4fd66e87f0fe241892669fd5b45
font_01_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 10400 bytes
SHA-256: 3929416ba48f00e9857e3bbd33511534bdabc228ef27232e35acd912b3cbe18e
font_02_sfnt_off00011d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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