Malicious PDF — malware analysis report

Static analysis result for SHA-256 527f283476e213ba…

MALICIOUS

PDF

74.9 KB Created: 2021-09-02 20:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea9747df0f7c9901c2cd5da21376879d SHA-1: 949b24cdfee1fbe211d4f76fecc7384c3e6bdf2f SHA-256: 527f283476e213ba53bb89e68de61a479d440e841469f2b2bbbfb7b9c7575a38
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://wineuniverse.us/userfiles/file/44659856622.pdf In PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/a2ht2m2hul392uqr4p0hmk0mpk/26834960224.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/41117065447.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/a35760f3733be0d84a53cd6b510c3c40/xomofimowuzugixo.pdfIn PDF document text
    • https://mediaskills.rs/files/69595710086.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/xagufumesopawovu.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/purigogem.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610d96194ae35---pararonuxoxadukamovubik.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/97653705807.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0ae29b38d---gupulajubu.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/60038366279.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/xatutajavab.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/xerunorazikojefuvodidamil.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3j4u6c2j7k1ta4hhvufavpqjh0/3723665885.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/xafusajababenowajixagaki.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/679bd26a522a791e28b2541318faab3a/vizarototikogeresusekuto.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a09ce38e---divipisazavupezaxi.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/51221061663.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ojk85rqcnios5cln3vvdpr3d7a/wusutupuvolilas.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/280132549110.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cca6ee2233---vimizojivinajene.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/25355829885.pdfIn PDF document text
    • https://led7.ru/file/17185699936.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/nl6pgni3mv5v11mnq9c2anaard/megexufuribevuwira.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/dowaj.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/lipudarumim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=head+shoulders+knees+and+toes+in+spanish+worksheetPDF 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_off0000c101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 10760 bytes
SHA-256: 2562e2fb0d28d5576c2248ee3496b15a9ee979067fe425727f839e2a39f37b7b
font_02_sfnt_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 16976 bytes
SHA-256: 87785d8d51c52e25c153d0cfc034988a61b44b1786503385b861f64846e82fce

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