Malicious PDF — malware analysis report

Static analysis result for SHA-256 41729694e6ba9f44…

MALICIOUS

PDF

69.8 KB Created: 2021-09-05 09:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f9013946198fd7d2494e495617ef3e1 SHA-1: 2957020e73a7e54e05bb62ed7b298156760caf41 SHA-256: 41729694e6ba9f449e96d786b4d546951ed89250567b89543ad105ea5dffcb33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://noddy.nu/images/file/24672879.pdf In PDF document text
    • http://fitviewer.com/files/file/lufegevolanab.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0b0a94125---vefegojo.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b15bba08c9d720aafba09e77aba37068/sedumowemo.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/nujuvixabe.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/vetoferonokuvinonodujox.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/vevux.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/32176100799.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/sipirusok.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160763eda2bdec---95823909588.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/11831779057.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/66990702537.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c975365dcff---wosabowufupovesewusizuxu.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/61812812286.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc9680a38---benafuna.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/32144417271.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/85823186119.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/87607467043.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/zibuwabufopimikiregafepo.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/41952014031.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/1067644249.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8alclp96j880old246vcm2mfhj/23162181862.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/zoridapeludabofosanako.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/a46d890aabe4a981dd8e23e13220daaf/2745024606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=palak+paneer+recipe+in+gujarati+language+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_off0000b108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB108 15588 bytes
SHA-256: 8a549562172cfbd7449e6a7facc760e034ebce378789c41fb595c71428044abe
font_01_sfnt_off0000d896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 10832 bytes
SHA-256: dd9ed467c20f8fd695779a5fc8a8f3f7205be6b8318a7157981d93abf903e5f8
font_02_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1