Malicious PDF — malware analysis report

Static analysis result for SHA-256 90db48f9ee46777c…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 11:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a6f620aff1738ae9902eb3ab0e1b9cfc SHA-1: d520f58e07c0f12da49fda4517fe5de1eec6cb93 SHA-256: 90db48f9ee46777c3f4c3a1ec923d2036d4f632906d754fae41e5a5e9e6d071a
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm hosted on compromised CMS uploads, suggesting an attempt to direct users to malicious content. The presence of a 'download' button lure further supports the malicious intent of tricking users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e579c79777---71244482766.pdf In PDF document text
    • http://mizuho-co.net/file/ck/files/12583203132.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/sotesamibimemizogo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/18bc36619c36fd993c44e18c5d73bb18/10561864315.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/8686ac1401b76e7895f49bc82fc5bef3/zujibojafi.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/3ae93929aa3cddf395d1d9ae5858ef27/lijezamaxudefabevuzefirap.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/8a15cf5ec66dfd3468a3683418b46da4/97669941514.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/1e45b1b891303c527489df34cfebc43b/zopipajuli.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/77855467228.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/66625929209.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160848e2675059---67922883687.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/fcb557f0967c15d4227b375c2a20a599/mefiwigegukakelibaribize.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dff9c6181---puzamijaxeke.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/tekokifagegetetif.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/aadab5e02aefc354cb87be40b745ccd2.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609e58eded8c3---40034427596.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/kofokaxopapul.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/58a61ebf9c5ef58ed0ff9c2b5463c5d1/12091719426.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/kmfst7jmga13icvva273s56q95/jagowinamoxugolo.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/28371231280.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bed801df0bef8c873d4aa4615ab4ab72/ditadexalazaledetefi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cae69f913---90721688974.pdfIn PDF document text
    • http://topas.lt/userfiles/file/79566317310.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/wezifezawo.pdfIn PDF document text
    • https://x-software.cz/data/file/vixopikerugewewamegemu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vsscpbga3mel43se17f1i80434/43526675599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=insert+and+delete+pdf+pages+onlinePDF 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_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 10624 bytes
SHA-256: 4b6d86c9a3dfb8541b9b3cdd87c95847a8c51b138d3851c0248538ebdd83f6fa
font_01_sfnt_off0001051b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 17460 bytes
SHA-256: d87bb00dd7e237abd21f069888d30d6f1cc3d1ec31b6898d35cb3ecf5fb38f52

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