Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99eaf57bd76acb3…

MALICIOUS

PDF

86.3 KB Created: 2021-06-27 06:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ad22e196521e374665c27a0ca6db553 SHA-1: bbdb53f09e5227a771190261dd6a863dd9db9138 SHA-256: f99eaf57bd76acb312008486c900836c2121a575933d8b9eb4b52f67a358a629
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to various external websites, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ajur.rest/uploads/userfiles/file/sameranew.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607523e311271---16703324017.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/352ab3fbcfdd480cde4db4e388533356/kinavekofewokoxudolito.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4e238e94b---31877946849.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f0689c817---waxarizoropebivilatazov.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/mhks79ujqvchh4v058ulqvsk4t/zovigabinekunojusota.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbd1f4e178---gajawaweruzusoxerowej.pdf
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/22612683387.pdf
    • https://nanosoft.mn/images/content/File/gojazogatanefirututizi.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7f4b2233e---85325928736.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a59420b01c7---69926626917.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c440a2745a---39637617856.pdf
    • http://heureka-cz.eu/files/sisuxidoveregomurilokiju.pdf
    • http://chithanhplastics.com/uploads/userfiles/file/pojeduxixuz.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/836dbbcdd43c45f6a88fc83a172db771/vuwomupixotatov.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ph2i73ae4njt2ula0r4bv5sgaq/xoxudusazakun.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3d68dc6407c2bfcef8a03b31abe19da6/24937091208.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160809a837ed75---59174741032.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/magavesa.pdf
    • http://commune-bourre.com/userfiles/file/nuwadezadol.pdf
    • http://gaongonmaiphuong.vn/webroot/img/files/subugi.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/m6philku3nqemduhenfpcolsa3/bokuwovenufunavu.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8c8adbc7---kelapuvaliwiro.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=i+got+what+you+want+and+i+got+what+you+need
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e354.bin
01e81703e727d63dbcde38b38962cc46237dddb3ceb20496ab865d74123cce27
pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 10464 bytes
font_01_sfnt_off0000fae1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 16792 bytes
font_02_sfnt_off000112f3.bin
905dd2af5f53ef558f0ab486383eeb2a46128640847641f9d987d6d3a4f7b541
pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 22180 bytes