Malicious PDF — malware analysis report

Static analysis result for SHA-256 6974b3c0a8e94c90…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 10:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5325d00a7e3edda52ab9d4b9a49685ff SHA-1: c23e08756d57dc111c7618c856192ec0ada53454 SHA-256: 6974b3c0a8e94c906b1674b3eaa53b87e0b20287236266f808656e0b5d6d5587
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs point to domains that are either compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hondatayho.vn/images/ckeditor/files/nixewiwariw.pdf In PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161513c8ec7be8---xedurovuzit.pdfIn PDF document text
    • http://benetalent.com/upload/files/22791817657.pdfIn PDF document text
    • https://menu2uplus.com/images/file/87878791162.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/17066667884.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/22248362108.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/54759145711.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/24145039089.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/53798490329.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/sijuzene.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c867befc---rejupurozotoda.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/3456174185.pdfIn PDF document text
    • http://platcometals.com/images/file/20690781856.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/68293795441.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/46371550184.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/fegumezesexawagawafag.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/tikuwo.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/rifajebofejovavujevaxep.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac1e48f4dc---90022054067.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/wuvolopafanow.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/313c04d91baefe5fa17b02a419a52bdf/wawozazeriziruvikibinumo.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/finakadatofizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=rising+force+albumPDF 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_off0000b15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15B 10864 bytes
SHA-256: 181b4ec9e1c388e709985b22e3e82fa933248cb92e6ed966eaa7e5109ff5400a
font_01_sfnt_off0000ca65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA65 16768 bytes
SHA-256: 10fcb9ddbdd788028980749bd54e747d9550e4b8b2f1fe8f033bde6c974eade4
font_02_sfnt_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1