Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c623a5c1cb9bca…

MALICIOUS

PDF

84.1 KB Created: 2021-08-10 21:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a23af4fa29e22890d0a42718b1f54423 SHA-1: f0278388d9041c407c29ddad8da954755bfc2f0c SHA-256: d3c623a5c1cb9bca0e06cca35d601750a90f5a662965d9152e6c494451ae945c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=batman+the+dark+knight+rises+download+in+tamil PDF link annotation
    • http://ledseoul.com/userData/board/file/divuxow.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/jumobufutilurakatev.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46cf995db---57884171601.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/bmrntlddgsp8t6r98hi4q35hb6/gozivozekaxeveweve.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/zosusaligibudomad.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/15792485787.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/cocb6fdqdpcgeoi80rddrs4q4r/zogefelejikojenen.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-2/20210602063733126597.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dea61526ab---6757840328.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/55110377716.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/31527414015.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19d2d1845---lagelesorir.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe422242c---radezi.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/sabamulalituxowa.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/solikafabilodufezuwaz.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e2b6ec73a3f63ee0283d7ab8c3de3108/30785030594.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ua035qaj2i4jc6ijg37to6is5/tinasiviwuzobidukuwitekob.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20d8d5fac---55709835522.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/dodorofujojinizan.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/7520303273.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/df936fa711b6076376fd37aa80ab3e6e/xatupopofafosifomamopi.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/nomekiverosovazozalopoxi.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/laxagivunogijibojij.pdfIn PDF document text
    • https://anfauglir.com/images/file/99216083681.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/vokibimikevo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ce1dbecce---janaruma.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 10928 bytes
SHA-256: 7cf88d62eeb14da1640576fc7b8c4ba2bd21d24e79d07bef1160a45fe8d7cbde
font_02_sfnt_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 17284 bytes
SHA-256: 930cf51379697fb6b3866f27b9fdd0fe846fa833ecd78537619aa9b47dd68ac2
font_03_sfnt_off00013a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A36 1284 bytes
SHA-256: 3f2eb68e56e0cc9b24f861ad510cb196f24dbc520975aefba06cb0b93c7ac786

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