Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd140798ca2913e…

MALICIOUS

PDF

90.3 KB Created: 2021-09-07 13:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d1a25818a13485df34d579a11883881 SHA-1: 63ecd38c611256b567c2ddf6b3a24d9175104a50 SHA-256: 1dd140798ca2913e3d67fae7e0ff5ea38395f135b7afaf9f8c50f5663493b0ed
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of these links strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cf07a0024---76303914289.pdf In PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c673ec73ecd---98640299425.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vpm83d7f98rg0p77g0mleffkg5/xusibifunilarat.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/90262238080.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/tixebavemaluginaw.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/jufudifud.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/29829609377.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/449ed726f0d9603bf966d60b6319b6d2/22796253969.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094617a09240---63576939295.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/67816361271.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a612d99ad50---kiguzusasewaraguv.pdfIn PDF document text
    • https://domilot.com/uploader/files/dujob.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/norujijuxepajofuluvagimib.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/ladegomumera.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a46ce80c5b6---relexu.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/6592620393.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8b85779d2---tinadu.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/0qd2cgh0fmtmsbk70mak4g8c26/sezopazaduwenu.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbe184996---3776047855.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/mikuxukoxag.pdfIn PDF document text
    • https://coevent.ru/upload/files/21249830812.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/pkkn1s9mo1jdhct8lkf6dftg23/34142226711.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/robijonizupodadej.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/252112315078.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/82270269094.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/19401226666.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/56173651076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=contraception+journal+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_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 18180 bytes
SHA-256: d138c343df66c3f09f4009e7108ab8d7fb14e30e683973c00077d453d20465f4
font_01_sfnt_off00012a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AB 10704 bytes
SHA-256: 870eb6dbe8a9844d1abae723d949389c0c8d6871f579b94b87b4a096a313a65d

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