Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f79ad39f45ebcde…

MALICIOUS

PDF

92.1 KB Created: 2021-06-30 12:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1dddc14d747b41297c156db4ae4e20fb SHA-1: b572dc9f331ae8057165176bce12c57ed82736de SHA-256: 4f79ad39f45ebcded1d6335419c04341cc449ca83eabbca02b4c2dddd6725d6b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://philabc.ru/uplcv?utm_term=in+time+online+movie PDF link annotation
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/juvelagatagizebenug.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14d0bd1b40---tepofusabazoxa.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4cdb0be70f4393b0bf73e87dccd33c17/58751486423.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/1unkeuojr2ad87llcd8703qict/wekorugufigalek.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50ec46887---vewesikopesisiketokife.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/0a8bf3a8d01b82d36025e638d6edfc99/gizisutavavanopobux.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/57691290748.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16093acc6356e2---6228208954.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/revezaxaxuf.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/fovotetupodugolimakuno.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e79c659c1---55219426384.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/xelanukenowiwur.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775ed56825c---17618808247.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddbc191dd2---38186061516.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ad9769f93bf23f7038148c1e4fc3ac30/mobogumor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3dc449936c---bidakevafibupugijolaki.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/eadf4c000f6634276408860c635abbe8/juxifusefipoluzo.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/xisubuwetudo.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/62048490349.pdfIn PDF document text
    • http://brukbet.com/user_images/file/3304630247.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084e93e554a6---guwakekufudijubinopufe.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/7kpoma1kq82hfg3igmu0kfrna2/56918670487.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160868cd74c77a---komijobamuzudenesugat.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_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 17740 bytes
SHA-256: 4c1c6008e85fff4b51d031b9ec4584a0fed803856aa82145535ebaf1c2c32b15
font_01_sfnt_off000135e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E6 9856 bytes
SHA-256: 1996d4f466ebb8543b6c8b64c575d05d7a239879ce9fd5a3b5c3a874e7cd5629
font_02_sfnt_off00014b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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