Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc4a8c9e9e6110d…

MALICIOUS

PDF

83.6 KB Created: 2021-06-27 20:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8f2ef0873e7a49e1f63c39f1866a27ef SHA-1: 80e3441863c52b4c031f4d1defcf7ad257ad6c29 SHA-256: fdc4a8c9e9e6110d18e9ee10e89988ee96e33ed3b1af29777b74e9960e9c772d
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns strongly suggest exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083596153113---zuduw.pdf In PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/aece2c35a21a7d8287188221ea6aa605/99543608054.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19d7f2f4ca---lelifidosibokosipotisamu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097dba202391---66548990076.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/o1i85vpaeo9v2qddbhgks1m2r6/88319060544.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/41500089853.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/96323480970.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/sesowamubuvajozikugex.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d3f91abde654ce07678eb3987ce869ce/49255091600.pdfIn PDF document text
    • https://tessuno.com/upload/files/60ce49e63e76c.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075e4888dcf6---84687140375.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160824494256f4---87868190104.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e531d900f3---gagafirojujuzoz.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ea531d8aa1c9de17811e8cac11f73dfd/lofurereto.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/54108039197.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/dij1tma56017qj1t91b98v288o/lokevaropen.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608443f092d54---vifapevuvadivuxuvijoman.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///lonuvagavewabewofawazon.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8bb2094317---27217658179.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/462e44c1fc8ae83d0d4b46da72a71679/51531795331.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7dea2128d---geniwudumitadoluloj.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/29e944b1609b47f8672ea0933156d713/fubatuwemiliwivabedofo.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/mexidabigisopisojexorakij.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/5ed02c694d1eefb43eaebc6a191da55f/gedetuwid.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/14aa189e75e333ecc10ff6b60fa72e06/78784158966.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/60630162406.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cf74dbadc---zavebolepiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mcq+on+dbms+with+answersPDF 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_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 10956 bytes
SHA-256: 3b0b4745da5a87b4f14fe3d2ec325501f5d92316d6a662a41b7c647069ba02b0
font_02_sfnt_off000113ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EC 17188 bytes
SHA-256: a919af234dce8cc9fd5152f863f824c2bbeadb4fe4c13e610367db68c6e14036

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