Malicious PDF — malware analysis report

Static analysis result for SHA-256 60dd5c4315d8e2ee…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 13:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2716da5e28e7ad0af6b1328cb8b8cd00 SHA-1: 652f21783098ecb4a605f2da9b3bb255f2784d50 SHA-256: 60dd5c4315d8e2eefed0079c15e0623978391b264a164d1e167010a7d8d8a1a4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs, many hosted on disposable domains or compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm heuristic points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://verkaufs-akademie.com/userfiles/file/wikaletixexig.pdf In PDF document text
    • https://asset-books.com/userfiles/file/83864270399.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210618_030718.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/lepog.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/gomuwobepogi.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/22bee60bdb0df42e00b503991f643101/13208297843.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/nuzoxogulosavelemok.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/50515010806.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/varunoxozem.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/22ah7il9ela7j2hu9ejmpki86h/61748656756.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/guwozamosowogugi.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/22371306856.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc49fcf10c---20565774781.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/13230455392.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/rurisoladofogatanot.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/fac7f37175843f196db7b08aa1c4690d/sejowerodotixudixefitamax.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/40031327379.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1i98b92g6obukblkp47h3qkpf4/niruv.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/25023869864.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/94887525519.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/soxokazovirotudodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=retaining+wall+ppt+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_off0000db23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 16940 bytes
SHA-256: 55477027dc24c0884184229778184c909d841e621edf6a6cd52508b7b49bf011
font_02_sfnt_off00011f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F10 10416 bytes
SHA-256: 81c68b0e9e354f5affbb9df52055e37c0777c8892efe146735365aef0ef19991