Malicious PDF — malware analysis report

Static analysis result for SHA-256 7990be622b349b1e…

MALICIOUS

PDF

75.7 KB Created: 2021-09-05 23:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2feddb6718872ada855073544c378bb3 SHA-1: 9ab55325f65702d91ca983ce2b18e7b26eff1873 SHA-256: 7990be622b349b1e7e35363d1e1742c00d22cfb67990bbabe7b812736f9bf333
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true destination or evade detection. The presence of external URIs and compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce860f341bc---40764412224.pdf In PDF document text
    • http://campbellelectronics.com/uploads/63930711029.pdfIn PDF document text
    • http://willbramephotography.com/56263532634.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/xanikezavifixu.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/zodexewuzemojotawujezefob.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/lifubaxuluxinafojakefuneg.pdfIn PDF document text
    • http://jaht.com/userfiles/file/gataxinosejokilo.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/jubuxisapixuvafulo.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/namem.pdfIn PDF document text
    • http://capri.lt/userfiles/files/sujirotomopigizovinomelax.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/xoduru.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37849705220.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/babetibivo.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/30753836926.pdfIn PDF document text
    • http://elskenecologie.nl/files/lugosiwegukasel.pdfIn PDF document text
    • http://614move.com/clients/4890/File/39593965287.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160750b349c346---xodupi.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/nulixadigobi.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/27022522558.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/pebaturonikibumetemin.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e49f52629c1584b0b5cab736007b98ed/guperovenefuruxati.pdfIn PDF document text
    • http://hopkim.vn/upload/files/pibabifaxakimeteguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=c%2B%2B+tutorial+for+dummies+pdfPDF 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_off0000c53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53C 16816 bytes
SHA-256: ddd7feb21fcaae93671637fe4195fe03dc91b87eb01fe5a15a018efdd9a3c7af
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 10688 bytes
SHA-256: 68c7ffd2dd13dd9fc63f25f575f0e8374ea03729b54e54a61ad766481807d06a