Malicious PDF — malware analysis report

Static analysis result for SHA-256 589cc59513eaf494…

MALICIOUS

PDF

83.6 KB Created: 2021-06-30 09:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 21e8eb24de4680fddc07ae04f525ef81 SHA-1: c4f448cade4e5f537b6ae232a22b9922e54d7bd6 SHA-256: 589cc59513eaf494cb5e7131c44251d8500d6d1293ebacfd85556aa6b96ef114
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate that the PDF acts as a link farm, pointing to numerous compromised WordPress sites and disposable hosting, likely to distribute further malware or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely facilitating the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://irlanc.ru/uplcv?utm_term=printable+letter+b+tracing+worksheets+for+preschool PDF link annotation
    • http://guides2alpes.org/uploads/file/kogisetuton.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c666d3577---rulonopafexud.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/aggookutvgv16p7t869btoqa9d/ximolufusutonowofaxe.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fac1cedc0a---3425812908.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/rikamuzugibesolaxug.pdfIn PDF document text
    • http://millecolori.it/images/file/44571873260.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/48430894897.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad292be0f0c---21089143168.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160706b1d9759f---16849449451.pdfPDF link annotation
    • http://er-trans.com/img/produkty/files/wokadosoru.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/52199366959.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c997bb8dbc4---97574895815.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/sokedawalasewemubex.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/809fd748b51b98c8ac7454ccf6a14d8b/1913189839.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/farazimokebironemuvibit.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210513/file/xubumowugedigexadotag.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/2422cf739b62681b46c1cc6c9d798556/13259699943.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106012320038502268kzli6.pdfIn PDF document text
    • http://www.bash.cl/media/file/gapozelaxitono.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9baea3c9---45487102763.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/42542864822.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/52440343265.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_off0000e461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 16548 bytes
SHA-256: a804bf898326e763c032ac26621a466f18719c06426d8b805eb034ff7972b879
font_01_sfnt_off00010f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F25 11080 bytes
SHA-256: e959b7155df383a1839e5146469533d4b32e9db6bd9473e464241a9a34de0274
font_02_sfnt_off000128c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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