Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e30edebacd4974…

MALICIOUS

PDF

86.5 KB Created: 2021-07-01 15:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e3c2d6387afee4dcbe0c54fefa0617b2 SHA-1: 51d125e4328af5a3c9648215902596be5ca222af SHA-256: a5e30edebacd4974d5a3eca19c253f8dc04b41d1c9ed6bf50a4434c8e04854df
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to solicit sensitive recovery information, such as private keys or backup codes. Numerous external URLs are present, many hosted on compromised CMS platforms, suggesting a distribution mechanism involving link farms and potentially directing users to malicious content or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://philabc.ru/uplcv?utm_term=cryptographic+algorithms+definition PDF link annotation
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2faf86326---javubokuvito.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/797f753390a6f485cfc1ab7c5db55724/lexojirobifuzejar.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160716f9bb99d4---xalaba.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/bebisoxarugexuxapaziwez.pdfIn PDF document text
    • https://vestol.bg/files/file/88502467594.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/43a1d13186a436c5f0c7ce9c6f31f36a/95335822483.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/sspk1k86mvqtlo72a3o5fig39q/64441097236.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/8148703371.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-24/20210624085125308919.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/8dmle2l11fksbhclq3pi734jo4/61514415119.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608726da54585---91321212237.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9134bee4c---27401857004.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18da2d761---titoburotutaxifugafutib.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/gexamezanixojef.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9133d9f67b---kujevoz.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/dawesof.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/paof4gpgboi1n67tb9oiiepel1/8624842140.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3d1b0d839---gifeninumifufupazunekani.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/26153825175.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6cc35d56366c180c8b2c0a1389b3fd2b/97034566135.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b925793cdb---63092950804.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b63b19b9695---sonazinew.pdfIn PDF document text
    • http://zuche0551.com/upload/file/19656997813.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_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 11212 bytes
SHA-256: e0c8fa4f29f476ce2838ea5e92cfcb7b35e26599b443d236c82503a983e02c6a
font_01_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 17292 bytes
SHA-256: 6bb6bca0fd0eeeae89dae5f500d10d4229be08bd09bac1164fe6af284353bd35
font_02_sfnt_off000134bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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