Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc262121139077e6…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 03:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7dab0794a1ac4e77f5248f81768d6345 SHA-1: 80a1cd0178d81c9de8f432c2e8b1a741069d0236 SHA-256: cc262121139077e645c1a3d82887e9b1c0dc1d01802243c0baa12d45a6139fd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis point to a spearphishing attachment that leverages external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=greenlight+capital+letters+pdf PDF link annotation
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a843086fa10---59032229813.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/77541344792.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/remexuwodudenazu.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35799230412.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/16097095709.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160700e2ac1cd9---4649512703.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8f563f84a3cfab468564845ee0b2a80f/74702404549.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1436d5df02---rometekefipepo.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/64491383405.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/72737567419.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dd7837f9d---vewagomigixutuninejerar.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/xogevovodufakitipanov.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/bezukegolaritekedekiwona.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/sujujurovikineguvubukupa.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/mexafinokibokovu.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/wakutagimirojeg.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/2f9f0ce4d88476e6dd6afcde356fb1bd/wezesidud.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58fae5e374---81602663879.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/xidumonafosepudugefam.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/bevex.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/i6evm8rpf87gdb0j0c8acrud4g/tejabumagilafuzu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b5ba0c745abb1cf1eea9fd5141b80aef/86347511822.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_off0000e04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04F 10816 bytes
SHA-256: 538116f485b861c7588cc108010f665f7eccab7806425d55a8b32228eda3e577
font_01_sfnt_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 18532 bytes
SHA-256: a1f665ac333167c1296151a1cb7cd14ec20eaaade813449d7d0dfe9af76a16b8