Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff51e050d5e9e9e8…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 11:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 144dfd231db104a196fd5084fbe97067 SHA-1: 0e8f3d5c0ffcc5643c30c11f6e7bdfd65a053937 SHA-256: ff51e050d5e9e9e87112e759ff42bd3b4a1e6900b1f2a8b6f8f89cb49a6be681
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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.
  • 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://medvor.ru/uplcv?utm_term=ejercicios+resueltos+de+resistencias+en+serie+y+paralelo+pdf PDF link annotation
    • http://liebherr-tr.com/userfiles/file/zijulixozinazirufebut.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/59882968386.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/3517a7a8dcdffe67db017fefff6a2a44/wojifapax.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/74985907926.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/019f10aa2684dd4653c880f3eb21c44b/talujogamunavoraziluzava.pdfIn PDF document text
    • http://kaies.net/upfiles/2108250241501593536km9zh.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/l2k6dv4kv9jc620gvs0i9cv8kv/xolamopuxogi.pdfIn PDF document text
    • https://purefeeling8.com/data/file/53581912035.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/12221372170.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a65f0840e---39387065227.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/84908408179.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/juzatilidixuzi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5fba679f1---jenanodow.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/8a1bafe3983fdeffa4b9393bafa58f22/10115099658.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a62330a651---46897207363.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd56e5209e---rudixakopi.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41ad21150---91803956099.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/fc6f1affa601a45af41a1e8578b2e8cc/56779818099.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/78ab1434d70e3a1023754cf3a71e9765/51094820080.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/wukup.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/sopowupitujuwekijola.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_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 10940 bytes
SHA-256: 6bfd87180bb7fdf213bbe1304855686ff80a1ba803e954a850fc7d6768f471cb
font_01_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 16912 bytes
SHA-256: aef6838d6e9f48c782f85fccc52e726f41cb1c9e2b285cd10973ae0592d61124
font_02_sfnt_off000125ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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