Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0ea1b623543a7d…

MALICIOUS

PDF

89.6 KB Created: 2021-09-16 01:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5264207943565fd1f266833a53a30a81 SHA-1: 1a74d466f34fdc56b0d4420e52ecbf821ff02100 SHA-256: 7c0ea1b623543a7d739f51683c838996593c741cb9a7c93386747bbd695c6dc1
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload directories, suggesting it's used to distribute further malicious content or for SEO spam. The embedded URLs point to various PDF files on potentially disposable or compromised hosting, reinforcing the link farm and potential phishing or malware distribution theme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/12a09eec38b90d22df76e5888c2b71c7/rinovep.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e8eb88ed---jumitigo.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/44295906242.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/61299758321.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/fugovosam.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/gupujabi.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/49599333514.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/livab.pdfIn PDF document text
    • http://airmon.hu/images/files/pejodi.pdfIn PDF document text
    • http://ruihuitax.com/files/file/viketokejorilona.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/fileritip.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/tajadas.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/95182537296.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/daxajodi.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/19938432663.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/ridifa.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/1359488226.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/21389620876.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/56052734367.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161332d9e3e53c---lumizovevuxabafiso.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/34311364579.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9de4b3b2---desakorofovirebozorakutev.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1aa29a303---jafavevabo.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/geduwazaxesevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=c%2B%2B+ios+developmentPDF 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_off0000f820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 10388 bytes
SHA-256: 232ae9c4e2585049ab4337f2b65c25da67de06bf2a8d9157b58187d8d37ffa44
font_01_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 18808 bytes
SHA-256: 1a8ecad869f234196f24c875554be3f05eda9acd6f18a00846449d55663705b3
font_02_sfnt_off0001412d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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