Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f6405c7a3791a6…

MALICIOUS

PDF

105.8 KB Created: 2021-08-15 23:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb57038d6e7e0356df08a18b617ecf1c SHA-1: 62c360606462dff3a0e99e5066b9d21b96fad19e SHA-256: 06f6405c7a3791a67a42dc41cef6cb9add18c5e3f56d8b624303511ebcee5ce7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely lead to further malicious content or phishing sites, indicating a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://allytemp.ru/uplcv?utm_term=penguin+dictionary+of+literary+terms+pdf PDF link annotation
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d170cf0cb---pisewowabagofizok.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/widineraxebadawij.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e1123ff3d6a---63978409136.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/tenokoporika.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/081836d040711a0168706e42a061c50a/3100721643.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-23/20210723145718599442.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/jrh0nk3g6jr84s4d31ubmpb3e6/difaxezetelagaviw.pdfIn PDF document text
    • http://navakarenterprises.com/userfiles/file/16910864585.pdfIn PDF document text
    • https://aspirans.com/files/file/nikipanuwasos.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/47799550702.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ab69aa1627e4f12be39a04338ea9eb7c/39518056864.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d67153a2ca---fovonudikutegutonifatun.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/4ee2f02a14eb2658fbf7268af6ef0c69/lozaneja.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/zasilanisuzexavavoso.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/57771793993.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/ee4c505865774f076e60d04ea996f56a/6461579269.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/sasodujav.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/2lf142ndaias8mskh93gjkj53o/72868135820.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/lejamedosawike.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/93728331058.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/37950363406.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721c3843932---70094817746.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607102ca13ce1---xudopimexesulabasirigerit.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6fd033435---1279099282.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_off000135b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B8 19592 bytes
SHA-256: 763f72fd8f4b9c7626e7bfea728303c26dc1fd3ef6bea0d35f94292da43bffa1
font_01_sfnt_off000166d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D8 11180 bytes
SHA-256: 4da4a93b4a0e42bdc2b8c079e7310b5517646c43a2dfef495d316fc68eaa37e4
font_02_sfnt_off000180d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1