Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ce0db815f041af…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 14:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0649e6f44e103cef2dccb3a31f589095 SHA-1: 5fd5d89ac4daa7788b6c149783d9bae0a9d00883 SHA-256: 66ce0db815f041af8b1ba84444fcc2367eb8d0561ba3ed1f5ee52ed3ef994ef9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the linked content indicate an attempt to redirect users to malicious sites, likely for downloading further payloads or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=roblox+apk+2021+download PDF link annotation
    • https://quangcaowebsite.xemlaco.com/uploads/files/35078003320.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/segemina.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/zozijebewuduzokej.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613074a1dcaa7---1458070969.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/72292741671.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134598689e1b---80533308330.pdfIn PDF document text
    • https://kapefashion.com/files/files/75408835084.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/sinaposexunevakuwaj.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/9312c272ace79209dbd8ec2d90554865/61335237738.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/gebimiwonutuxetebo.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/tipusiriki.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/60539133258.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/51971556551.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/39059972593.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/rexalop.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/tupaderux.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/7515297456.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/lijuxakekasozuzibati.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/63124592196.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/3917899874.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/17420328781.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/74223671853.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/38240354188.pdfIn PDF document text
    • http://myesen.life/userfiles/file/14380090969.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109101459249516.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/60434074855.pdfIn PDF document text
    • 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_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 10556 bytes
SHA-256: cbedb2e88639dc09ca940ddb031a6cb5c880eaa48a5877755ce2258496c8105f
font_01_sfnt_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8A 17864 bytes
SHA-256: 961b274ba0f352fa74d6fb0cd08cf06205717f2d916d056d08f3d156433d2e49

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