Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f550d7588b37c2f…

MALICIOUS

PDF

70.1 KB Created: 2021-09-21 10:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 454858af9bd2a948ac6e780984ca15ec SHA-1: fad72093763646cb3e17bfee8eab5c55fba0f5ac SHA-256: 7f550d7588b37c2f5a4f0aab29add8535dc9015fd4f7c473fc2c1a45ef4e8c22
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and detection engine findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://synerhu.ru/uplcv?utm_term=mx+player+pro+tv PDF link annotation
    • http://hoaisonland.vn/upload/files/jazenotaw.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/5rnijvscgolfegmneq9sq1s4q9/69581241403.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/63232860633.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/dawivulabozadi.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/52232373706.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/pixewipexurobop.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/vuzekis.pdfIn PDF document text
    • http://esen.life/userfiles/file/99189349018.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/33448622540.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210917061025_654489.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/buxomusemofiviro.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cb20b60eb---63923297135.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/31119944922.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/35002806746.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6ccb52996---bugugi.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/64324592019.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/6710990459.pdfIn PDF document text
    • https://unaizahic.com/Files/files/gefetilizofuvovelefe.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/jolulomixipugosome.pdfIn PDF document text
    • https://festacontinua.it/public/file/70612758953.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/27299758867.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/83917997137.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/sidetowogexebejiganibuxe.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/guporawon.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/nidepezozumaxopuloguvup.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/84311116461.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_off0000b3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AA 15780 bytes
SHA-256: f960e0f75ae236469d4792e378a0b9e79bb373cd18eba7cf9f3c9bae94abb6e9
font_01_sfnt_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 10156 bytes
SHA-256: 92200f55911f270f2405a5e6dbfd346572e82881751755552d2aa985652e8b7e