Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6b2ea7526961a7…

MALICIOUS

PDF

89.7 KB Created: 2021-08-15 21:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 902cac2f43ef9248bdb114eff5b7d647 SHA-1: b7746bd6f04ec10d35b51f3413164596a6aef3f9 SHA-256: cb6b2ea7526961a7bad0d7f1a7f7245ab4dff88ce5e4b97e17c112386e2cbe24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://studioingegneramato.com/userfiles/files/20317206180.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/belaxerub.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f548cc924f---74637494812.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc5432878b---6063502438.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/60994282859.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/mitugimabogokesozelofopo.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/be01ad4556e0cf7bf5e1e51414ce8367/71069782187.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/36150288632.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/4q06ouqkeai3i1803s43ofsep7/womawanojemofofezigib.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/a55e90164c92a3e412c8b9eaa75575b5/notolujul.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/gobul.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202107/file/31300948300.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/eb5f37b09bb146d954617e923611f9e8/10927993317.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee52ac2c14---52491754293.pdfIn PDF document text
    • http://att-na.com/upload/tezawoveme.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/812c0a1d05519d2a84df1b64ec1add43/96210242788.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082ebc92e0f2---nosakonipolizelorazumofef.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/xurubazufepesosimez.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210613130742.pdfIn PDF document text
    • http://falls67.com/clients/50406/File/viginerameganemapumoxefaz.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/24434549773.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/94717967303.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/18796818895.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e3a210fdd---wugufofowezo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e142f166e---60044010174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+change+from+standard+form+to+slope+intercept+formPDF 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_off0000f6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 17828 bytes
SHA-256: 0f2ec62fb72f9a1c019fc54290018569ca9fd49cfb4f6e30a91eacace67a811b
font_02_sfnt_off00013df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF1 11144 bytes
SHA-256: 40b8d1536135baaa7538f6b5e2a8af791443f86a713c89526a281dba52b97eba

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