Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b9cd17dc24c5ba…

MALICIOUS

PDF

88.8 KB Created: 2021-06-26 23:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0912bdfc2fb154485f79ede1fbd04129 SHA-1: 1ba63963fe36a2ff9e4d5b0a83760eed28a128b8 SHA-256: 57b9cd17dc24c5bab9c2a734a161ba2d5738dda84f5557a92600fc052668b8a4
204 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm hosted on compromised WordPress sites, with one URL pointing to a PDF file within a formcraft plugin upload directory. The presence of a 'download button' lure and 'password archive' lure suggests a phishing or social engineering attempt to trick the user into downloading a payload. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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.
  • 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 http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc8bce821d---66613843354.pdf In PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609201eb48224---2665826407.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/7645261116cb68fdaf9c3ba2b4143d93/pebivafunafavakodifem.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/l8ceocpjq76pvt65gvnt2fnvfe/xufabubewaxurutom.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/64447099987.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/fgm5u6hipqlbgd6lohcbl7328b/39082360322.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/88089128860.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/de3d96aaa2e5662f92216135e4ebecdd/75346267463.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e27b1e2f028cddaee004ea499c5456a1/28724946320.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/9d260bfa059a64f48f1af22399177b4b/vakexixu.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e22855d164---99293739787.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/66032045649.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b95f4f92a---43211601485.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc5fa72d08---95889790794.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/sotuwijanibu.pdfIn PDF document text
    • http://distributoram.com/files/file/33734231436.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/nbdgs34fdnanh7f36fkdafonaf/88739887647.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/83585000790412e000dc1d604b64a4f4/folitixumavafadufavowez.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/lotowijojogozowosorumi.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac713a59e7---vanobomowibezumananobezo.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/nofotiduluwosozaxugirok.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021051910133373499.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a83760de122---33150476760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+i+recover+deleted+messages+on+androidPDF 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_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001105b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105B 10856 bytes
SHA-256: 4f3d74e34c40a566d577960c9268840c5b76d0b8d48e3860ead432f2fb420303
font_02_sfnt_off00012935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12935 17072 bytes
SHA-256: 01b20bec4416cbc32c07e05ddac8b804aa4aafddb4c73b887e9dc45005dad0a8

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