Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e62c398fa5b3638…

MALICIOUS

PDF

72.9 KB Created: 2021-07-02 18:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4beffef0130a64abb7e651a20573b992 SHA-1: a244a47a1d92053d1a3aa20a9aad1311807b1dca SHA-256: 8e62c398fa5b3638ab511169d3d1496d088c0d0fd49f6dc47b273f5ce5a8e152
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external URIs, many of which point to compromised WordPress installations and disposable domains. This behavior is characteristic of a link farm used to distribute phishing content or redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=ps+dhogal+electrical+book+pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/qac57a5nphadpbmarjkfv4la01/92503428669.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e59ae9a113888d373b56cb6b1307471a/wapunewumowimu.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/snq1nfruvrdrlq3bcq9d0u3oqv/bijodajatavinolowomogek.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608948e9429bc---mulidupuj.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7c8b2b165f68c024179ffdd8957f11f4/dudesojexinojevumik.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609022eb346ac---jiwujinizi.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/xiguxuzepodoli.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873dd6aa9eb---14467878950.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2578f3cd8---28868476400.pdf
    • http://vejwun.cz/images/29048065548.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0d682def---xupira.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e3fb16d34---74238522008.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4edcd8832---71593199304.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dcb7327ca---49873925966.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d6923b11---togowosafudarogemebanew.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa74930e9e---14196992826.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/e57a877b150b8a528dc06c49dfe89b63/vibukavogazigusexo.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c27d15e588901140e6c937419fff7427/tesorolifokoz.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c50fef32df54fe0bbf951e5f21646767/fekel.pdf
    • https://acgroupenterprise.com/userfiles/file/tepufaroxulinamumam.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3c62fca5ee6ab65b1d1cb6374dbd3ec2/jerewovowuromi.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160719db700793---23451105973.pdf
    • http://kapli74.ru/upload_picture/fabusutim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC53 16792 bytes
font_01_sfnt_off0000d465.bin
a696f6aae176301b749a7d16ac2b5907f62738e46c7b85763657d81ce6078c06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD465 15816 bytes
font_02_sfnt_off0000fcfc.bin
c4c8e636bd1a7e2ca4ea8754c5b8457a7ff58d11f2a46228275e6dc15ea1b380		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 11028 bytes

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