Malicious PDF — malware analysis report

Static analysis result for SHA-256 1958734c3b001bfd…

MALICIOUS

PDF

85.4 KB Created: 2021-07-04 16:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d27317af1c7be4b6270cca34de66f72 SHA-1: 8e906680b5653de4039ac4d1845bc9c9a0d06ec0 SHA-256: 1958734c3b001bfd77a02bf3f53b93510e8c1328ddec6fc1f7fcb8ad5f8d1118
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which are hosted on disposable infrastructure or compromised CMS uploads, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farms indicates a likely intent to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tilestone-pools.com/i/File/vumonixiporu.pdf
    • http://sns.hu/_user/file/lesokuselu.pdf
    • http://train-in-japan.com/images/blog//file/tatufivazaxemavuropafog.pdf
    • http://greece-ex.com/images/blog//file/47997471445.pdf
    • https://fajndoktor.cz/images/file/files/lunuzatafaxafubedaxota.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/diwazuseledeperimefukutiv.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966e7f36841---85979451773.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ljt1lg39cofnuomsl6j052tjl7/nipilisamisokol.pdf
    • http://hiddenroots.org/clients/19739/File/badodekopafarofut.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/o7vts7md1r5tdfvbvkhnbq9e19/senudes.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/1ac84768ba31893d7470f91fd685f957/pijoninovitilatutizeson.pdf
    • https://psychologgia.pl/Upload/file/46755048408.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827688025d8---94409769262.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e64db449ad---56830682327.pdf
    • https://biomedchita.ru/imeg_master/file/66635570725.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070c8a1ca52d---99403071843.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c574833548e7285616acea0764bd3552/vikixuzebov.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728d243c98c---petuwod.pdf
    • http://christschoolblr.in/userfiles/file/jaraminisoxijojo.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5upluik9bgeuv14g9aghdunqne/xexawejamopozodokufiposu.pdf
    • http://agriturismolescuderie.eu/userfiles/files/13025647704.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e5164ae9d85f4e83b793edcf3027bc6f/37608751498.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/1ec2d6de672ce028d2bfc8d88605667f/kazowudafaramasedi.pdf
    • http://mkngsp.ru/upload/files/mefijulazenamavijiwatota.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+fill+bucket+in+minecraft
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea55.bin
7f564da0b58c65dbe731901765dbf089f54dd11a3dc59141e4e27a3c61c8ee1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 17220 bytes
font_01_sfnt_off000117b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117B4 16792 bytes
font_02_sfnt_off00012fcb.bin
eaf2f2428af706900af049d54b6e7c9969019c25bd69844b41283328983637d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCB 10740 bytes