Malicious PDF — malware analysis report

Static analysis result for SHA-256 2143164f3d9626fb…

MALICIOUS

PDF

81.6 KB Created: 2021-10-25 19:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 523b17a7bed7a2fe4a2f32f03f56e70f SHA-1: f1c824c5693ee301e665ddfa52ff1b80d1dfbb54 SHA-256: 2143164f3d9626fbb7b6de33f7d9fbb4490b237365d010d3415837c8ea7e4e4d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links are likely intended to lead users to phishing pages or download further malicious content.

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://drafthe.ru/uplcv?utm_term=8085+microprocessor+ppt PDF link annotation
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb5c40fbb---mutogowovixazodetadire.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/wapenipikixe.pdfIn PDF document text
    • https://aokman-drive.com/d/files/76059585236.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/fibapa.pdfIn PDF document text
    • http://gains.kmvindia.com/ckfinder/userfiles/files/18337112423.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/gelitigagudem.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614d768b46753---92244039961.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/powab.pdfIn PDF document text
    • http://sungder.com/upload/wexaxenedomozasigis.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/xemerezini.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/22493051813.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/xojupad.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142f63277687---8913080565.pdfIn PDF document text
    • https://aashianarealty.com/file/57464013107.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/61065941370.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/29768861636.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1bd0ea703---93872683777.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/71226485835.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/24902997926.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/25872671447.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/meforavomutiluwuwa.pdfIn PDF document text
    • https://soechi.com/userfiles/file/20842577481.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_off0000dbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 17320 bytes
SHA-256: 98dafcb382ab8d219abbde453fee2963386af8a4e0fb3e4dd3f3ac8e8bc64237
font_02_sfnt_off000120fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FD 10592 bytes
SHA-256: f455599f6879bf8b05088a6259ac29c977f80424020fa24226474be113430fe0