Malicious PDF — malware analysis report

Static analysis result for SHA-256 321b726500f8d2e0…

MALICIOUS

PDF

91.8 KB Created: 2021-07-01 00:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 995daa1ea262365bbe6538f92b7e9dfe SHA-1: 6a15d4f53be4c7b9160a1170c7b089f2313ad00e SHA-256: 321b726500f8d2e0e9081f017e5beca37e91a9c483a34d63157be28aca682994
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://arkystudio.eu/userfiles/files/sekuxo.pdf
    • https://xuantruongtech.com/images/ckeditor/files/54447633419.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/8753459360.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7800fc3d4e---jaxoxakebusarofiludazo.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0e18255607fcbd414fb245ac352ad4d4/78129282877.pdf
    • http://batiment-tunisie.com/userfiles/file/17381370981.pdf
    • https://candbco.com/ckfinder/userfiles/files/zesititijavitojuzot.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609054e6a88ef---84033115603.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ac848bb3d---65878417293.pdf
    • http://elazentrale.de/images/uploaded/file/4841713444.pdf
    • http://pathtojanna.com/userfiles/files/vijikebizijuwigi.pdf
    • http://isgsrl.it/images/file/fixalap.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3dabba2e369269fc4788cf0e2cad1e5f/mulemokumarumedivedol.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/786ada24844e154e6ef03f282968e73c/numiladomivub.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607002fcd8748---kawibi.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16098dfa80c468---kulujorekek.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/6522755968.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607561417f780---rigafifesa.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/fq0j2p3ri0g01g20snvk73u8p0/mirapomilekesajabojapi.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160acbd345c1b7---87656547789.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bc8ca14b6---mumixi.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7d026e797---sipidusidar.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704ff71c199---11585320368.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rene+magritte+pipe+painting
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001011e.bin
a0ab933cbd4b96af8da38549da5126c523b83f1f94bdcc900f8355d7c00c99e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 10308 bytes
font_01_sfnt_off00011849.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11849 16792 bytes
font_02_sfnt_off0001305b.bin
6941547aacc15c931c95adfc3873512a676b366ca766794707e1df14cb553dc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1305B 19660 bytes