Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a6258795fc4705…

MALICIOUS

PDF

70.7 KB Created: 2021-09-01 21:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1aaa7ef2873261be3be7fe6387a0f311 SHA-1: 05ea4e596999d94c08f5143f43994ef81c4bb979 SHA-256: c0a6258795fc4705ab1db8bb751791436a5788e0f60b1989546aa00067289117
176 Risk Score

Malware Insights

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

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content or download further malware. The PDF_IMAGE_LURE heuristic indicates it likely presents a full-page image to conceal clickable elements.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ddbcac82ef5---48980545038.pdf In PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/18218577181.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff05ebfee---77001797568.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2da9edeea6dd462f0145ebaf51706d72/65193514975.pdfIn PDF document text
    • http://www.polni.si/Images/files/87553849818.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/86987468048.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210715_214744.pdfIn PDF document text
    • https://micsys.in/userfiles/file/makepalanonotufume.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/7722160395.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/70231090337.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c76496f705---69791930519.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/h4jr2r2sfbpd0bvmadb3b6f9um/tikuladexug.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/soxovubegi.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/zexafexobigawozeg.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e5baae3239a68247bee27cd54f7a4fa7/fibititu.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/81730185706.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160890549e38b4---zujatasinunid.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/82268355335.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/82585538511.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0689d021b---nuzugozifikajozaruzakumik.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/77832984365.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/taperefaverewejugawovu.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/18585007194.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/waboxabixisalugi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/26919995667.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/10c968659aea9d2a97e9725d5d1f4eac/supetefogifubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=golden+fighter+fishPDF 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_off0000ba1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1D 14092 bytes
SHA-256: 8f8337048d9946a389ad8f1b8d66f77a38ed8d759579fda31d97a9c29740fa5c
font_01_sfnt_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 10508 bytes
SHA-256: 358eff0bea3b4934e47e61e625266447254674c3a6593586341bb60036c6be6f