Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b866e73afd280c…

MALICIOUS

PDF

75.7 KB Created: 2021-09-10 04:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 874069c50bc7061d5da0d1e4d3a56c51 SHA-1: 6c532e144fe49aee99048318b0652483736c6f45 SHA-256: 52b866e73afd280c3cfac11f13bf7faa8a543bbfc87951f50e23997cb019b93a
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and a link farm heuristic, suggesting it is designed to redirect users to malicious content. The presence of a 'download button' lure and ML classification further support a malicious intent. While no scripts were extracted, the overall structure and URL findings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=garena+free+fire+offline+mod PDF link annotation
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/16451f8b2b6de52b2cb09ebb7145de79/48787749728.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/tatazijizexiragifula.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/tuluzenarizitaro.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/buvegukuzemibozerokot.pdfIn PDF document text
    • http://erimti.com/userfiles/file/2148308010.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/bomemisulasipid.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/59647925807.pdfIn PDF document text
    • https://datawire.gr/files/files/52984875606.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/libij.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/kazava.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/badodazokifaxozo.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/tadodafatisutisopi.pdfIn PDF document text
    • http://naso10.com/userData/board/file/51017222629.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbfc24383---petegulevosimofajafinovo.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/82476374042.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/9488845884.pdfIn PDF document text
    • http://cold.lt/userfiles/file/53861160979.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/29905738136.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/8530412336.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/fopumigotiporuzegedomek.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/93066225536.pdfIn PDF document text
    • http://mextro.de/upload/files/89134731906.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/tuxudopakuno.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210908152822.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9aa6b2587---nitujamelota.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_off0000c6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 10288 bytes
SHA-256: d83a822e92be221a986b4f61d4774c80bfeeb7f56f52d6ca83dd072b125952e9
font_02_sfnt_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 16940 bytes
SHA-256: 2bdb225835b9814b21a47fc70995fb03d87e7fdfb70d2358e61b4e97fc9db947