Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdb1066e4cc1feb…

MALICIOUS

PDF

87.9 KB Created: 2021-09-14 13:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 111ce4adbf5647961ea05f38e6700cf7 SHA-1: 5343fb9efb00b7f88ad6bd5e595cc7ed7f96d60d SHA-256: 6cdb1066e4cc1feb71d5b6fe65ea654470d3861386bb365181b1fb9bf4e0fc90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm intended to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hataylezzeti.com/resimler/files/xivepadid.pdf In PDF document text
    • https://ladymamashop.com/uploads/files/202109100845483465.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/petewusipafivazas.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/7362678999.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/57127428271.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/woxebazuwulitozinabeji.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/62011767977.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/tepuzobepejuwagu.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/judokela.pdfIn PDF document text
    • http://schokofontaenen.de/idata/gokudijigexukedika.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/21503927644.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/58138771820.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/77246391860.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/m5a66t20dfib1aramp2r947mp0/bujogasuraganejel.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ef6db96b---23653459001.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2098038a---wixofazenuzesomanitu.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/70164403644.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/66260926864.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090711031255.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/29984621860.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/dofetemaludazezetoko.pdfIn PDF document text
    • http://potlista.com/file/files/62758632104.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/dovulipowi.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/guwivegab.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/kerikufebabeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=vidmate+app+download+filePDF 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_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 17608 bytes
SHA-256: 658ce28c8f145e0d630c9a127ff8832e936bbf46b0eeb7241e003d23c4045bdb
font_01_sfnt_off000122bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD3 10444 bytes
SHA-256: a3c1c8d1148c3a1e7196d434880dce69fb00c806e0de3b4494db5af7740a0d77

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