Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af1192823cbbe37…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 05:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a87630791932b6b536f221ce1479491 SHA-1: e4f1c889fbb0542c2f6054d6837c73af87b0a004 SHA-256: 3af1192823cbbe375b60751b81096a053e8ef651b4d28ec78a6a064a64cd4617
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded links are the primary indicators of compromise, facilitating the download of further malicious payloads.

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://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0bb265f6---6981556185.pdf In PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/42454821841.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/tufixijumakowofiwebe.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/49307844669.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/96878116608.pdfIn PDF document text
    • https://edusfera.pl/upload/file/dajojixatipave.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/zivoruj.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/mlkml90ppmskr4o910t8qp80va/65993115316.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/37568130203.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/zaxafeziji.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894ba7c58ed---63980522498.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bcef547572bde9e9ba6ab6fcf35ddf15/vagitikotadixinavipo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/gi992d47kut59te1q44s1523nj/75431580661.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/wisofon.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210803010505.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/wejun.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/dadasijitawotitukemok.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/13980252028.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7376189513---buwonemojudupebux.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/fopizepofipilikebe.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/xepaliduduriva.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/5526d01bdc464ac37eb092a42cd549cd/fukinavexanogajemoj.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7a1c276e---gogapis.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/36439418300.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/50851251167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=business+research+methods+blumberg+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_off0000c41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41B 11360 bytes
SHA-256: 8ccd52287249e8bbc40d61866cfe2c4bea0b7cfc07447093a23cf554afeac0c8
font_01_sfnt_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 15604 bytes
SHA-256: d3e482eb3cce745e059cd0789d1a8678e625a6a3839e437440998bcc074acb6e
font_02_sfnt_off000105c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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