Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc144cc52b0b43d6…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 22:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3dcf85eaa7876bcf8ac6cdae7dcc838 SHA-1: cf94bc80c1947f0da56708ffad6791ae94a67102 SHA-256: cc144cc52b0b43d61d70e5c7c512fa0f334ab4f118dc2459a9f011fa4e92450c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this, indicating the PDF's primary function is to lead users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/036dbd4380a8650bc1def6126fefdb73/28883943408.pdf In PDF document text
    • https://bwawarszawa.pl/upload/file/81822887196.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa0bc21f25---nijijozodijuxijusoxola.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161206305eaefe---67456163602.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/68974036843.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/0lmb725dm0lncl3tti764ppg05/37921673275.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/78963849238.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10f60a6dd---81444895540.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/lipibada.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/97359815614.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/kspi88rhosvv5snaitae25p0qf/xewamawufutafawesizegekez.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/jajofudamijavejuwatox.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/17952388946124d2c40e9ce.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/39669021319.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/fepubobubus.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/66438351061.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb38ca2d28---25673978304.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/13466866731.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/wipelobuduketunonet.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/mukenutako.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/37117965512.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c1ef1f7ff22377de17f2d5cb8c2a78c5/rubupukuliv.pdfIn PDF document text
    • http://seamacros.com/upload/file/kurobe.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/857a55f21c4ff39f70c88b321d1b6216/32108751232.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/novutajelewutegamadixasuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=interview+facing+skills+pdfPDF link annotation
    • 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_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 17192 bytes
SHA-256: f89ff9bb6a852e1c1b8c931eedd7a17161783eb5d0984eb5520c9ba2c14a1b78
font_01_sfnt_off00011941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13158 10868 bytes
SHA-256: 5b62b618b2bb990ab103c57af88b00ac98ddb6488588417cd0220fbc087b388d

Open this report in the interactive analyzer, or submit your own file for analysis.