Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9019531861f3b6c…

MALICIOUS

PDF

84.8 KB Created: 2021-07-03 08:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0e81d4274342c0d16125a3605e9cfd17 SHA-1: 11d8044adfb81c755a81c98f3ac7fc54a2f75928 SHA-256: b9019531861f3b6c57038f6d98c18c9cd2869ae045953c964d2f6ce2b8fd09b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. Multiple heuristics indicate the presence of numerous external URIs and links hosted on potentially compromised or disposable domains, suggesting an attempt to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn--22c6buakeib3ax0bzcc5b8tlc.com/userfiles/file/zufedovuxajinekulomif.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d5c378bfd---bodunenofajole.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5e69e44d39ef74a7166af7689e0022fd/91599664534.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca915e1ce0---32528654456.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/vsonuhi81pgvo6g924t29hludo/fidijovodugame.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/vjbvss7t3k4stl73rvfg5mkhr2/602359401.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/83197004372.pdfIn PDF document text
    • https://morabia.fi/images/file/rivodotovulixiwejuf.pdfIn PDF document text
    • http://goldmustang.ru/files/files/vakexexojogewufobuzige.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/riwawilobimuro.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870b666f3c9---mevisas.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b6976dfde---geguzar.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcfe8140af---gebaxafixibure.pdfIn PDF document text
    • https://campermagazine.tv/public/file/zimovejamarezawevid.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ad5c412d0f06ea5aa524dfcf006535bf/dokefewagugawisa.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/kelobabawarirexujunatem.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/90bab9453af2d52ca8a3e332aae8617d/14396847643.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947677f0b5f---pomofojapugilawifad.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/rofuvuwutomaruzutawof.pdfIn PDF document text
    • http://chayka-svg.ru/files/59795153773.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/buwuxonijug.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a1eb5c57a---49379165337.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/74313676490.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///54104032065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+do+thread+snakes+eatPDF 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_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 17556 bytes
SHA-256: 49a3293fae888d18cabf582635b199f988f54a20586fb4de94bb092b1f47c2c6
font_02_sfnt_off00012ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE0 10292 bytes
SHA-256: 8c6d736287aa85065fc3a724eeff4e0c8c5cb028ebe26a127018541e5be42598