Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb608aef3df63e9…

MALICIOUS

PDF

87.7 KB Created: 2021-07-17 10:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e80c296fe90756efc05cfb467e75498 SHA-1: 2ac0968b1a43a7ce1c1d4e223c85d415523b0da5 SHA-256: fcb608aef3df63e968f4233df4f9cfa7a85e5f8da8667fc005f0e263853be797
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/sofdtu408gu6echeo6nuk5cd43/zeludazepivojawotoveburin.pdf In PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098b89367617---zozarofonoletorep.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/4219341904.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/609c8ec2b88ab7126b25964f1efda3c8/28016593671.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/951e5289a03c760c258537d0d5aaeab3/fedafaxekukotaw.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/jobalufojemafiva.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdfe70885d---6893104129.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5237837cc08dc9d2ff201764b0300cfb/fanabomajejanerovabegi.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/37914144419.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/b79fe65034a9a7a8e060bd6265b6540a/38117822761.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/rujopiroxiwigepuv.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b600ac8e7c69bc1f3c799cd3c7c5fdf2/55337117551.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/2740099541.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/52090161346.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0aa0c47fa---vudaruxar.pdfIn PDF document text
    • http://blackshirts1960.com/clients/876325/File/1268647439.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/pojizaso.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094183bb7c0a---52780422077.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/58756106111.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/55a10f8b84d48e003013ebdcf1df6e7b/14879125452.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/75378462658.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/tenot.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/zonisabalasezonofozi.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/3744606806.pdfIn PDF document text
    • http://amdind.com/userfiles/file/17898585541.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/344441295b80d11f4dfce49ebe4da1bd/20209310597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=jim+parsons+and+toddPDF 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_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 18276 bytes
SHA-256: 1fb2cb7d6fc8887fda5750889c66010f68bb6793dc35838b15b5b8d54a4b7939
font_02_sfnt_off00013a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A02 10364 bytes
SHA-256: 0c01ca35bac08baca3956a6bb970eead18868737d80241b43da0454859f75d74