Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04160ce7d7dbd73…

MALICIOUS

PDF

71.9 KB Created: 2021-09-07 01:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5b14c30bdf238b2ad29ab7f93b616606 SHA-1: 8a52446d582c1520cd6f8269b4c142812eba6292 SHA-256: c04160ce7d7dbd73e75d3e6f94ef4ef08ea93669feb1f5f7e064a992f594d9c3
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 0.9982

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://nomylo.ru/uplcv?utm_term=where+to+buy+manual+screen+stretcher PDF link annotation
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/14b1b04dfaf146682a64a261b1a660b0/86395151545.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/04078b45017243db21e6a6782ab86b4c/xedujebire.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a7599ab53e90a8b30976ef22e95fabd6/mapotogapagogabaxo.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/nekos.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831a01a09a7---xavupefanoririboke.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8ee4e66ea---1389017755.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/bitif.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/50662472117.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/sagizugovu.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/37115297644.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/31632396500.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/60714054170.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/gagaropikonubel.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tc54dajps0n1rfq68bb9ggf607/89379069692.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/17800637493.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/fuvo9ulopig1vbk9impa39n883/fafid.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/26031811849.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/lakajef.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/nodusoxet.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078639f576fb---98062462701.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/xokop.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/56436566452.pdfIn PDF document text
    • 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_off0000b956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB956 10748 bytes
SHA-256: dd7bbb6519a98790f27d7fbdba425129f21df6c793decdad3ffdfef5ac3a8ef1
font_01_sfnt_off0000d203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD203 15720 bytes
SHA-256: 60a8335cb8d734444ec949b261db8a5c191fc92b45d610fa2061e508a32b998f
font_02_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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