Malicious PDF — malware analysis report

Static analysis result for SHA-256 196607ec7e961247…

MALICIOUS

PDF

79.6 KB Created: 2021-07-05 06:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d5dd9fe844ed7030f467164d5dbc0a4 SHA-1: 7915f0e8e7617d942fcef721d33758a23d225aec SHA-256: 196607ec7e961247cb9b2946c0c30b6a63acd4fc3d082e4d4baaa002f9391b01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=patellofemoral+joint+pain PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd4d1ce1f7---16501979456.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/talumenupive.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/15982660970.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/19147689856.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/wixitelupivoxetekopu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/m2ueglal2k8c0fps1643oaf7ss/92345213062.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/gomafisudabu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb47aae797b---33600470155.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/81747562301.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/18345807709.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/bgk8op898gjqi0gcj49pt7ods4/67007217996.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/ruvavujorifokavuwipeso.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e45780eeb---tokevulado.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c0d83318348df6d037b8076e6fa1992c/95078089708.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/dotononogotetawukakenen.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/33612264879.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/82273876467.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34ee6d6c78---21507900074.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160970f4d3ed00---jizekixejikipofav.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/badum.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/cd969e070c1856d433810e6f2bc6bcfe/fogefazovumejabulaxox.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/230492e35c0087c77ab1f19699381da5/82847941574.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_off0000d753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 16392 bytes
SHA-256: 0f229f305d46ca1f7d549ba97d0c32c5c9e81b37cd5ea002f60920a60261ab25
font_02_sfnt_off000119b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B7 10480 bytes
SHA-256: 48403d00dd789b3c3d45d92e1edc5ac2a8623bb7598d9ef3a9f96459c4eac136