Malicious PDF — malware analysis report

Static analysis result for SHA-256 e407000fec5e59f7…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 03:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 90f6f466a4cfa09f84ae90b89fff4b77 SHA-1: afd8a0504442cfaf3a8fb0f6659e8947e6df8f98 SHA-256: e407000fec5e59f7472052564ac96770e9ab4042b87089cd2960b82b229c82e3
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 lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/a2c696abd2b3e5bc5a70fa58ef6625b1/20478231656.pdf In PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nalefojulivalixo.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/33504092693.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/vavovazex.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614150685860f---xesiteg.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/36621117704.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/gukabet.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/32887004571.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614091f86b682---pilom.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/47320633018.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f24a6848dedd9fec552d22168f3c6915/16268157539.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/53240623729.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/76988791806.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/jiguwomulujoburenenepasur.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141c3199a497---88281528716.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/60306168943.pdfIn PDF document text
    • http://swhos.com/upload/files/dajirisomimutepexudufenu.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/73973879331.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/kixokonoguludubo.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/8672053448.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/zipivuwijipud.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/sedewag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=recover+phone+data+broken+screenPDF link annotation
    • 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_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 17096 bytes
SHA-256: 357e15686035d63a6c4415e60d0c1a837dd53f24a14306299019a3fc78886f32
font_01_sfnt_off00010034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 10816 bytes
SHA-256: f2d7959000c6fdf2e2c17c637999805f2af143890d9ae7c3d2c768bdb2bac28c
font_02_sfnt_off000118f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1