Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad702b6770fb2738…

MALICIOUS

PDF

82.2 KB Created: 2021-06-22 09:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f10867840195d84c23582742981d8eea SHA-1: 420686d3901f7dfb00bf9f90b8457f47b62aee22 SHA-256: ad702b6770fb2738b447f7d24e9669621a0b569cdb01cc3779440a8e7e910fe7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9996

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://drafthe.ru/uplcv?utm_term=reface+full+apk PDF link annotation
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160771a48eea63---85464500800.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c76639e7d---39460564538.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/81273234187.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64cc3cc89b---16881147569.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/xafoxezekenanogarisiwo.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/kotepe.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c2e218c9f---kenemijew.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c6e744c5dfad1337d3eb97739a15d5a8/19537577708.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/nigoxe.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/23191227789.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607791c12dea3---84656423465.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e50e53ac9---bejifekemi.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/51456106937.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • 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_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 4808 bytes
SHA-256: 4c28a64d1627cab6483cf72fa517279273331e5be79b1d71635f8b979a911abf
font_01_sfnt_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 2936 bytes
SHA-256: a5260e7b524df459db2807d91a64a93b6813fdeb114a7f40e2afbf9bdf6ab690
font_02_sfnt_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 12344 bytes
SHA-256: 2e6bf86e9252bffb17852e3671eda739ee03b708424adfa016e32e9121c7983e
font_03_sfnt_off000124d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D7 16196 bytes
SHA-256: d1a4c78ef556d8252eaaeead95fd6e0540edb04596780bf3770e55fda0b1f776