Malicious PDF — malware analysis report

Static analysis result for SHA-256 442184abedd3a93b…

MALICIOUS

PDF

74.7 KB Created: 2021-09-15 16:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52fe9e150b14d05c5be852519b74e7ea SHA-1: 6f2011c7d0b57c82364afb281fb555755b15c041 SHA-256: 442184abedd3a93b003fb48f071585e06db75eca315580fa69b9a1839a47e2fa
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating malicious intent, including ML classification, a link farm pointing to compromised CMS uploads, and a lure for password-protected archives. The presence of external URIs and a 'download button' lure suggests the document is designed to trick users into downloading a secondary payload. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=mame32+download+windows+7 PDF link annotation
    • https://bjjewels.net/nbloom/fckuploads/file/50520319185.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/11959429695.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/futowuzujura.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/seminizuzatedanexinobopet.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/rotugakibovasalomit.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/7q9odiru0ulll3ig1cpvo0okp3/23804523332.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3ra9p5lufn6csga7c1344alpqb/bokozer.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac8a00293---kebezepufalo.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/xukokomatotef.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161342717f0718---lumewubem.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/35323198279.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/45289302670.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/74120344403.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/57943326669.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/98514997329.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109121942343757.pdfIn PDF document text
    • https://soechi.id/userfiles/file/lapafosejezexexi.pdfIn PDF document text
    • http://videocycling.info/files/file/76794823510.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/31218283337.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/99290525963.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/sexisirifogaxikezaf.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/dawudosabubobiluvalitabip.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/2accf42d2a982b8616d7351bb5d8671c/48467960365.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B2 16936 bytes
SHA-256: a4d5229db0a5d5e7d70805eec950de75d4ba173ad15bdd19bc27a393b40c0c07
font_01_sfnt_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 10632 bytes
SHA-256: f4e39c8717bf152a527918e1729c9db7293e9c0baa3d6e2c1486574b09852c4d

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