Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8f34f293d0b988…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 23:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 76b38ab64e8aa79a0b17b7ad7e9cad4d SHA-1: ae855981a0570196c17cd5d2e97fd54e0b36e7b9 SHA-256: 5b8f34f293d0b988dbb09fbdf49df001a7bf5b7cac6b0e11fba17de29ccc0555
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final malicious destination. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=auntie+mame+script+pdf PDF link annotation
    • http://dlt-nkp.com/fileupload//file/63211634523.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/64182629943.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/walodebufipumanirutimeg.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607908f98d06a---40042482139.pdfIn PDF document text
    • http://msiutilities.biz/documents/84448710460.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/2371759088.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/raxavadefasud.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1bd485f27---nurevakunixuriruned.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/05527d4aaf62f1853d633f038168b80b/vadekarurejozenivumatuno.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/536209273.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/kelirolarufeju.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/getudusaxupafu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160762230afdf1---10129846972.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/nezemesivebipulivel.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f35c67542---21811126145.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c974e012499---8833315275.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16114250756c62---wumibami.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161276e48cd1bb---dakosozidabogomif.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/zixodupadom.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/62741475391.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/nefexolerusopimuvop.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/fujanuw.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/bujufemanupolatujififu.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160867df925845---zusuxeninivudarugosakuf.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_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 10696 bytes
SHA-256: 752971d3eb23078d5cb1da5a82b638e92006ca46a5a0c1d5a0daaf4d6858ed17
font_02_sfnt_off00011656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 17980 bytes
SHA-256: 5d94ae4e1c0043ce521d91fc193d5f366d598bc50c2097d7f9d24d792ec45c14

Open this report in the interactive analyzer, or submit your own file for analysis.