Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9fd16eabd104e6…

MALICIOUS

PDF

95.6 KB Created: 2021-09-05 07:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6d9c43d634d8115d9a058b129c2c9f21 SHA-1: 60e10b81550b66ea48b1c9fde66cbe6f5190c6dd SHA-256: ec9fd16eabd104e65108d76885caceea349e46f3957708eb6e8024e5c57dcd9c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms within documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rimsball.com/ckfinder/userfiles/files/bususewapikido.pdf In PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/damasibepapubukiliken.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/62041656911.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807255b642a---86032433873.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/78009061670.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/nobosazajaxudolugadusuzi.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/17696839531.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/39714397005.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/kufawu.pdfIn PDF document text
    • https://rotitelor.com/contents//files/pofigijejatuwix.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/4339614553.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed4b762958---44653106792.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161140467d1ad5---dosolebiwepekes.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/55daa886bca2f21b286e3b8b83d51152/20593960469.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/27579014493.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/18725355095.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/f3nsq0u1e1r1d4064rm4prgdi5/8079380300.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/gadobesukinuj.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/sebowabevajuvavekipovu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/5269af3dc55d671da94e639a1382f930/43065982643.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708c68885d1---dumetororojedekidun.pdfIn PDF document text
    • http://yjccnc.com/upload/files/82472454173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=analyzing+a+poem+mending+wall+worksheet+answersPDF 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_off00011103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11103 18004 bytes
SHA-256: e41d7afb2a1641c834515a9f35ab9e973c8fc893cf4a6832d00de4552b2abf1d
font_01_sfnt_off00013f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F23 11172 bytes
SHA-256: 8d2bbd86113851839ecfe88da1f271fa9ee68b1eeecd84ed2b3995ad5c16a9e3
font_02_sfnt_off00015900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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