Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd03a0b4ac0a6b46…

MALICIOUS

PDF

96.3 KB Created: 2021-08-03 07:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1cb6214cdd130ed359e74b2465e6328f SHA-1: dbc0e85b98cea0bc83a411ab22572f109c1ea48c SHA-256: cd03a0b4ac0a6b467f54149e2327eae0f4796471df5056861924bf8acd0eacc2
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The document body is unreadable, but the heuristics and URLs confirm a malicious link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://onnetsolution.in/userfiles/file/11419516020.pdf In PDF document text
    • http://cascinamana.it/userfiles/file/617956409.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d33da5f0fff---66981108110.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ghmgd6qvptgalj6bqeso40heqg/paziwifugu.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/doxupuxavakezelim.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/840fd2961a31a368359769e1795826f0/35304799614.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/1c52bcf765dbf200a82c316188d8d4bf/70788872421.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/43481634580.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cb45d6d78---nunulezaxesesobujewubagun.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/85311843679.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/34538774525.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/272136113085.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/zatoj.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/wexugi.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ced3a54c14ae86445a929c5ea3198ca5/rafudikexulewubel.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6e42d32c---zeganafenepinadira.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b292c07db59---62318058510.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/xinunisobut.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/28451074670.pdfIn PDF document text
    • https://digireg.cn/upload/pilulotelutis.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/gepiru.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c2b13f8d2b08b8e44491f25530a8b265/zipotot.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828df7f11f9---bazeremuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sample+interview+questions+and+answers+for+business+analyst+positionPDF 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_off00011247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 11388 bytes
SHA-256: 72c77ecde825530557a44ff3199cf2335f3107703e4587fb21859eb71fc05629
font_01_sfnt_off00012cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAC 17548 bytes
SHA-256: ffb205cd2eae741b4771499e91b8348f71ba8020991f0a6cfad1cb2aebd1629e
font_02_sfnt_off00015a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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