Malicious PDF — malware analysis report

Static analysis result for SHA-256 822d9d8225b99f3c…

MALICIOUS

PDF

110.7 KB Created: 2021-06-27 00:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f1a71bf8b9b9971444725fb3cafe8a8c SHA-1: 1ffd5d315bf30b24f1e1b45be2a991581531e746 SHA-256: 822d9d8225b99f3c843472915277f3f0a2be7df0e2bdb6d4f623ab1990b9937c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains multiple links pointing to compromised WordPress sites, suggesting it's part of a link farm used to distribute malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e1264796e25b4ee7fa7944bdf06872b3/kuzimofivatotuzodebex.pdf In PDF document text
    • http://brandiassociati.it/userfiles/file/fomujarolomapirizu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/j1urfp31bp8fe8od3qh1ggpok3/9158332408.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/fozanurapevibimalexutu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f32abc80b---40749038165.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607483f6467d1---livavakimilixukufeb.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/49383226646.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8d20a627a5720f5a0656f66f17d2c741/57035917370.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4747ae4b3a---gozesabesisa.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3c809edba3f6ecfea5abb6cfd94aac92/roxekatopisupexazoj.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/474bdaa2c8d0c03ae07da92f9f089426/sotosavuwodatagevogomejaf.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e85e0baf49add01b14ca4f727dc5fb1a/30310153354.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca82574112---datibotesudal.pdfIn PDF document text
    • http://kochi-mimoto-iin.com/TakamatsuClinic/userfiles/file/gowaxapetagufoxasip.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/dupake.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c9e2bf2bfc565f3c8818c067130050f8/19607028156.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089912890a84---pogaxu.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e2e706ed03194ca30a2b74a849ee5b40/57219191084.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9502bb0ce---kojowajure.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160753ac4a8e38---80410558693.pdfIn PDF document text
    • http://fygl.net/uploads/file/271414248799.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/n2bainrunafcqa49qg7bp4qo9n/44397517952.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/fowebejan.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607157b478c70---sugemezojomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=romans+chapter+7+questions+and+answersPDF 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_off00014d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D80 11160 bytes
SHA-256: f1abe97fa1d6e0a2260bac8816bd25763fa8fd350890d942c27b3497904a5a0c
font_01_sfnt_off00016753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F65 16904 bytes
SHA-256: 6db1cdc53a4c3800e20a0977b7687c84826c599a17c78639417fac37e97441e0