Malicious PDF — malware analysis report

Static analysis result for SHA-256 e517816d358553f0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 03:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21b195bf7724c0dbbd7ca31d3f3bb331 SHA-1: 717985897c920234016c8a25cb67b1abf1652b18 SHA-256: e517816d358553f0537f8205a136c4358f7b1943471cca46bb5f0446f44144b9
164 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS uploads or disposable hosting, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and a 'download button' lure further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://www.anclupnapoli.it/userfiles/file/mowarawoweva.pdf In PDF document text
    • http://prplus4u.com/ckupload/files/lilopevew.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/rawonuwutu.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/db984205e1947285aa4f1be99f8b63ce/96647162267.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ee6504e27---fezudikexolote.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/birasitemepesanibudonuzo.pdfIn PDF document text
    • http://farashimirooz.com/files/fimefanifugoxiwapezubitix.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/80475759495.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089703fb43b8---68765396683.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/64005165332.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/xogobenu.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/61872685973.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/91112656568.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/38d1aca49cfb495b614e35cf4d52df84/17314788284.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/qrt87m8l9lbs078i1vep1dbpmc/fenipigunetamo.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/4505416714.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c62fc9f97---kojetetisurevasibiloda.pdfIn PDF document text
    • http://millecolori.it/images/file/petunogexi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ig2mgol60f191s5lr3hl7lon86/52825932490.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/laxinizedasub.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/vilivubakumukekirufuxen.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4c4bed2dd---35635491599.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/20885398296.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/17615570035.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/66147203156.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b19c963069b38370dc11965a22af80c7/66430401672.pdfIn PDF document text
    • http://kaies.cn/upfiles/210525185929940235y9zfct.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tntet+psychology+notes+in+english+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_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 10712 bytes
SHA-256: c4d2264bd71a84ea873b6d1ce6af68bbd402985790946f809bc2a9fb139bc97c
font_01_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 18040 bytes
SHA-256: 7f256e4d19c2360e6de28d54b42bd9dd91511ee10f58e94f752e353e73f9fe28
font_02_sfnt_off00012bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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