Malicious PDF — malware analysis report

Static analysis result for SHA-256 7991aa0a1c2f1e27…

MALICIOUS

PDF

88.2 KB Created: 2021-09-15 09:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe958181727c4cf1a7ea3b7716dd5cdd SHA-1: e90961593dfdf496c4aad1fba7ce56dc8cf94339 SHA-256: 7991aa0a1c2f1e27501ae32c2dd98a127fa6db360266bc5488f4d1336e42ff65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on such hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://archism.ru/uplcv?utm_term=house+of+harmony+and+vengeance+watch+online PDF link annotation
    • https://marmetal.cevhertemizlik.com/userfiles/files/12137172120.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/o8vvdil1qe2r34eg3odblarssa/ludosu.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/tekibevopurexofe.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/debureriviruzu.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/21148567950.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/87270298020.pdfIn PDF document text
    • https://biomisszio.hu/tmp/vogatov.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kborstppla44stjdjh9ensn785/37538205668.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/42787600689.pdfIn PDF document text
    • http://servmed.net/userfiles/file/peretezovib.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/xejewe.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/sedivotuwuluvivukadedon.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/50021988954.pdfIn PDF document text
    • https://red-adlay.com/upload/files/momokerubo.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/29551610105.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161363287cbb8a---37233553541.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/59985505383.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162a16765e---wuzusavilo.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/wawunajin.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f472a58c57c1d2708947ba4b55e5c968/66268962492.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/tolonataduvef.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/bexowazasar.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/vebodejewixefabuwaz.pdfIn PDF document text
    • https://redac.ch/upload/pavapugugajipov.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/purubafem.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/zemilikisijusa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E2 2584 bytes
SHA-256: 2c8dddb3e66afe14c6f98c220e110c340db925579a453df7d6c1cfbc72df3135
font_01_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 17820 bytes
SHA-256: 7dfa2799f140990c587f2f14bf7e4558459fd0f6378625e1b0f2a3c5a9d109a1
font_02_sfnt_off00011e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001362d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362D 11280 bytes
SHA-256: f6025907e05b520c4db0969d554b7ee15b024bb1b62c91d38ff31c4374e69cbb

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