Malicious PDF — malware analysis report

Static analysis result for SHA-256 a725b345e3dbfeba…

MALICIOUS

PDF

69.6 KB Created: 2021-09-18 07:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f046b9ce0c3d4ad1b3cbe1f9dd5eee4 SHA-1: f18a1ee7c9ccc213c048f9e99cec885d90246500 SHA-256: a725b345e3dbfeba6ab8f1afe6dc715f082cfa9e3bd475d3999f22d46b6a77f4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=new+online+casinos+australia+2020+no+deposit+bonus PDF link annotation
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc971b5db2---64001944121.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/18154759323.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2445d85d0646fb5e1e7749ff2e347407/94072658558.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/1304608927.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/vajebasilaxutoxo.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/77143570585.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/punanagukos.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/vapigow.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/26354402825.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109140423424714.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/66832448504.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/tolixekugatureru.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/73539582142.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/wefixapikobib.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fcb2b161d---64093650173.pdfIn PDF document text
    • https://dm288.com/slicice/file/56005992671.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614357cda1f4b---katejupagufajesozatak.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/bb87e5e6b0d10870a5dfb532c0ad4268/filazobebotawukul.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/lumuwibuxapixugozubo.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/75471755973.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210902110412_708135.pdfIn PDF document text
    • http://amdind.com/userfiles/file/zufidolufirurudur.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/13963774875.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/91626054311.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/nozurexejimowuwofexemep.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_off0000b2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE2 14552 bytes
SHA-256: ab810fdbfc85715ca8ec3c1fa13968064b06a123e7037b5d764fae242491d66b
font_02_sfnt_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 11052 bytes
SHA-256: 095d7045a8e3f37593eaeb96bd369a4fd27b34dd0076c2d90d34fb05fd36c52d