Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05cd8de775f4f04…

MALICIOUS

PDF

108.1 KB Created: 2021-07-07 02:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d967beabf959f97b7942dac096f77d6f SHA-1: 3231c324e940f57d6e06601182defad0998a8f91 SHA-256: c05cd8de775f4f04305a0153c4f2480f5f0046777dc4d7b48c40bb2b9f54301f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6283

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://yepsell.com/userfiles/files/90569459479.pdf In PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a384b7b83---1537281990.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090ffe81ddc8---86808393109.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160753eece93a1---97352383792.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/7cc8d3acdc5a49fa74b306cdfc17b17a/gubiburevigiwuvazuxa.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/foxodurodelaz.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/u8dlnteq55t136skknqqcl5ffj/zafewarurajok.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef81b4e5f---45892529322.pdfIn PDF document text
    • http://strandedtattoo.net/file/futanarenowapet.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/64c7b1e11c253a07ed3be9c8dc3601fa/11684706276.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d95d7f81d8be8ea7b9a682a48bfb908c/vusuleralan.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc80cd2b9---bitumojopurifafonox.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e1debb40---19534354091.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/ca245999aa0df5e5cd14dfaf291993d1/82146523861.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/noguboxutepa.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/nilimoz.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/59693695137.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/52694957209.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/10377169536.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210629205315627367tnj93p.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/muregibikazodatozerelid.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3mbde8ut79asc3maotli1mg4m0/59136356927.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16093a2ce3a24f---17174169331.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/dedbbdd893617df2f8d5017026e8ca84/sarumepatemibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=subway+surfers+old+apk+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13945 10908 bytes
SHA-256: d0b4b3a068b3c33ff49921a84fb9229f81eaad95571741e5a0f6f5b62e5746eb
font_01_sfnt_off0001527d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527D 17068 bytes
SHA-256: 7a7a7317b4bed150d528b25d3a11f396aab259624ef18920e2e71c6b0a3bd57e
font_02_sfnt_off00017e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19675 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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