Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fbeacd69b14558…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 11:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f94de2c1298a5f6bf20c0ac3d2374794 SHA-1: 680483752eb53789b9b661d5f1a5648a2898c0bb SHA-256: 23fbeacd69b145587d4df879e0d2b81c2cfaa225cbf13819cdbcc403dc34c1bb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to host and distribute further malicious payloads. The presence of multiple distinct hosts and the use of WordPress upload storage suggest an effort to obscure the true origin of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa752829aee---51402271352.pdf In PDF document text
    • https://mszukam.pl/dat//file/xoxosuboturofitijalo.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/xotibejoxilejugazugalar.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/bedotulepifobem.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/43120172153.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/wujikozawadexazufevexo.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b0bb134deea33c017c006741976ca36f/40633164407.pdfIn PDF document text
    • http://anysoldierfundraiser.com/clients/a/af/af293656121fcb8b60a8c910089dd81c/File/mezuzomerakedazodefarape.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/61286072645.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/gaxol.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/15317110868.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f660dc00cb---31709364666.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe4737c29---gobulewujamujijusag.pdfIn PDF document text
    • http://asustainable.com/global/file/53119905190.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/zapir.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/zowapuwivi.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/divuzawekeponegitezadix.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab30a793d7f---winajapusowezalibujupe.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/kulalobaputotulixanupob.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/81g65rjfrcmbo2mfjpf4tsr6ah/duwifitukufaruto.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5elc5hutfkkk633cgl3hp0dd53/muzorinagebamikuxepinuw.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f06fab3ad9---wopek.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946967240dd---megesefuruzurewuw.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/32754974121.pdfIn PDF document text
    • https://afayl.com/userfiles/file/falawokozabaroxinexemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=water+spell+in+harry+potterPDF 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_off0000d6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C3 10456 bytes
SHA-256: f5f59a7b3a7e629318c3259b9b4799a915fabc18c40de439d4b449eb86acfc1b
font_01_sfnt_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 17324 bytes
SHA-256: a72feda389af17fc3081a44b423b9cfbbb88675922cbdce04828b06b9f0f202d
font_02_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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