Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d23fd477386923…

MALICIOUS

PDF

77.0 KB Created: 2021-09-01 12:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f58fbe39cfe3284742cdd567108e3cf SHA-1: 19d85c328fb0a6535f7f1d6b88f64aa0037a870c SHA-256: 41d23fd477386923dc3261f85dd7b749136c54e8c978d8d1c8ee8fe46bac14bd
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised websites, suggesting a multi-stage attack or phishing campaign. The presence of external URI heuristics and link farm indicators reinforces this assessment.

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 https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771baf068e9---88190801485.pdf In PDF document text
    • http://madison62alumni.com/clients/e/e8/e84cd6a5166dbe8c5f6852bff763f4b2/File/3810628408.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/putoratadaxoxifopasatugig.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/72622258940.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/dazafikesawozenonoleren.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/bolamopivulo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070cdbb4b8a1---pozitewasa.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/5e995d4249ff116ce5d605376079028e/93121742234.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/sowosetolojanorogixif.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/nevajigufap.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/95492168354.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6e993281c---58693657692.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c9ad3fec92c9b0bb0b158c97a71ecc66/19335579022.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/62028487799.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/80859723429.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9fd2n0rgfssl41icvaoc59l38m/mumajidugabol.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/3bb461e9f6d52993778ae11d1c8f40be/podim.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/woluvesowewovagobex.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7v2r8krgre7oup6ld7lvnnv7v6/kuxojume.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021080606212073499.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/8a03b145cbc88c78a5c3e3cfa7362ee9/vefat.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/ramasageler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=open+word+document+in+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_off0000ca66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA66 10616 bytes
SHA-256: 481544f5fccaaffc96b24a016e9b48e61d7a94c8b02517566e435b093f88a735
font_01_sfnt_off0000e2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABF 17088 bytes
SHA-256: 981119ccdac3048183a649d579994d0aa20297a4cd6a6683e144e00c9b0aecd6

Open this report in the interactive analyzer, or submit your own file for analysis.