Malicious PDF — malware analysis report

Static analysis result for SHA-256 8331df2d06faae27…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 14:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02015393467e079091d148f649a8f947 SHA-1: d144fa1bdb3235c0c11f9dcb1e35ba6c0948a5a4 SHA-256: 8331df2d06faae277d616df46c594d47ce7aa38a626358a28c5290488e852cb8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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 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://crewmak.ru/uplcv?utm_term=concepto+de+metabuscadores+pdf PDF link annotation
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa1ba94d36---vakibofuxonenive.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/juvetuzagi.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607258768b8da---libufawirulakanirekenoxef.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/74374152517.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-6/20210906080131116697.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/a6a200217a6e111a673c8647817b8b22/51831495485.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/16519771618.pdfIn PDF document text
    • https://12shio3.com/contents/files/pilibuwilixedikukisipuxin.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/43158392394.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/xiverewijupuwogokapubun.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/79932416330.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/94606922981.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/81867628989.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/gazufotidufotot.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/88424704649.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f825ea66ca.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a7ddc624cc---lisajuwijomaxirexu.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/95164140503.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/37557976903.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c03bd1d5b8---nipogejenesodilaziwuzi.pdfIn PDF document text
    • https://electroagro.es/pub/files/pazegevaja.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b32c7415401be0eef576710ecd1b906a/sezizemivaj.pdfIn PDF document text
    • http://ccshecea.org/upload/files/nifoxikisozezojopisu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe37a1d6d---xapojajipejutepamul.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/sesimat.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/35345141892.pdfIn PDF document text
    • http://beijingteye.com/upload/files/diritevoninomejuj.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_off0000d171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 18656 bytes
SHA-256: e61e4350a59161cfc7e15cf90704a5cdc8fd78e25cfdfcd0c37eca0527c5c7e2
font_02_sfnt_off00011937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11937 10912 bytes
SHA-256: 55fbc7cb62fb7de2b1c36736f2655a44b1a3dfc584fa38308144894738f8bbab

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