Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4710d9142bcf829…

MALICIOUS

PDF

74.7 KB Created: 2021-09-29 13:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d368219976373d293357a1c2ff91e8dd SHA-1: 479328c1afa5334ff00ef3b7116c02b54d259a2e SHA-256: c4710d9142bcf829b7552aa234e637387b07ddc74aa1b5183f19508d0e7b11b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. It also features a link farm with numerous URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crocepadrekolbe.it/userfiles/files/fezizajex.pdf In PDF document text
    • http://runo34.ru/attachments/file/gugalibug.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/9426709730.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/bibivagusumixotobixes.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/sifelebafebewuf.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/melipudiro.pdfIn PDF document text
    • https://hoongnau.com/upload/files/digigijivomifek.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/goloforukonuvojosevigelop.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b888ba1047---30590546589.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/zaxuwekerudeg.pdfIn PDF document text
    • http://orderkai.com/uploads/files/16242682640.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/masetulujofovujonilofe.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/78368444680.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/fokudege.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9e6f1d95---megominijosos.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9634472640.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/53467206013.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/30346050916.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/kisuk.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/85188164192.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/jutanuzobenipilot.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/mekawi.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16133b20b1b048---19959277991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fast+battery+charging+app+for+androidPDF 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_off0000bf90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 17240 bytes
SHA-256: 689e0492f11ab4c43aefb4fdae819acd46886ccf245b18790c50e4e096e7a523
font_02_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 11084 bytes
SHA-256: d4833c4fc25dec6aa501d0aec5ab37c034cb35a6e1365c0515be4db15541eb36