Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58eebbe66a74a73…

MALICIOUS

PDF

78.3 KB Created: 2021-09-14 01:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39ef3255fdd082348b0b92243e9bd15a SHA-1: 79346aa9862d224e299f20883fbae90ccc6b6e64 SHA-256: d58eebbe66a74a7337a10352a2983567a79c6a80e19cb266da2cd3f61ff200fd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm and a lure for a password-protected archive. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware delivery mechanism, likely involving a second-stage download disguised as a password-protected archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://signauction.net/userfiles/file/67720352619.pdf In PDF document text
    • http://domadoma.cz/userfiles/file/xasagakapezalak.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/virivovonejizoxe.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/5735060468.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f89dc4f8---somenekase.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/77223207149.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/29296786557.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/a8374ao9dcql9toic20rtvp763/tonofinefolezosuxivez.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374be0d2852---pomed.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/3aec49ead105696a311fb3b667383be1/98606170773.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/22681130272.pdfIn PDF document text
    • http://ttc-investco.com/img/files/vuwunosakizuwovibobuw.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/vuxivurekatafekelemej.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b5abcfd5f5e84a7ea8d723cd95d1e6ed/povusekiro.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/27647181522.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135be25bbe31---gapikomenixil.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/11307179654.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/86894307084.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/97471786631.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/82923876441.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/bugikewuk.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/savufepokebuxoxire.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/35813482537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=lost+outlook+passwordPDF 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_off0000d00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 17160 bytes
SHA-256: 90cb8d59669a2e1c0d814cf7885c8571347e1cc25f6865ed9e63fc7d21636629
font_02_sfnt_off000114e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 10292 bytes
SHA-256: d3d698becc7f8b8c86744e3f89a8af8152dea0c3e7dd7ab2ab29998d3873ad45

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