Malicious PDF — malware analysis report

Static analysis result for SHA-256 0161f68e137acdc5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 03:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4467fb9c500588ffb55021973c6fcc5b SHA-1: b12398d5605ebceee3614ea2b645a0edd69f0f6d SHA-256: 0161f68e137acdc5b3218bfff70a8f4caabb428b9f0944ee315a69d222d35af5
154 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 0.8520

Heuristics 5

  • 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
  • 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://skikk.be/app/webroot/files/userfiles/files/36597212963.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709f349219c---vaxawuzan.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/61393800408.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/26459688330.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/55169730212.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073f31012882---34662578249.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a4cd139bcf781d957ec82a6df9ae0997/73042130459.pdfIn PDF document text
    • https://mauspro.net/upload/files/fagopufotuxatizopo.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612117f1a337b---86464695795.pdfIn PDF document text
    • https://baongochoa.com/upload/file/nuwigapuxe.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/75330be44250eed448942d898ac9fd3b/43056724797.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/98494449884.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/24073324811.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/r0a5iq5ei3kmoi9u27uj8bfbj1/tulun.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/89632513346.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c13e244e8---pifogezijila.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/e21ff43d4c0f4edf5f4f18dc3bb3db77/47323860815.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f8345b43---98432925545.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/fb013e67e97f36fdc56afce092f8ee26/89485803840.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/g74knbjclh3qgevbsk30493760/27153634552.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/donisid.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609440bd2c0b6---6599345194.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/28621953693.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/gh40om7vtihlljjpdquufqe32r/rarorevabufazixor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=being+alone+inspirational+quotesPDF link annotation
    • 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_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 18292 bytes
SHA-256: f3adece7ed392b960438a4e46c0c45b7170839a26af8b11f2dbd0c90056b2b84
font_01_sfnt_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FC 10728 bytes
SHA-256: 19329ee706022724e785dee01712ff190c472aec7c8dc542d068998ce6d6c574