Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc659c7a8c1b3a52…

MALICIOUS

PDF

99.4 KB Created: 2021-09-17 06:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9aa45575000930a823bf9d33f5efd780 SHA-1: 89628a53059379f663b2e4c2a4dcbfe8eb008ef7 SHA-256: bc659c7a8c1b3a52bac6e3d6e9327f7a93c5b87774f60672bcb387424e644ff1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://textosolutionslinguistiques.com/upload/editor/file/winepexivawolov.pdf In PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/besip.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/kimabenadozew.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/teruxilekuwudi.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091217080250.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326e26909db---zetekisuxisonisa.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/46033255709.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/nibiporo.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/bimur.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ea2eafc4---44230706959.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/xopudenagumuga.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/50721502493.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/lilevupetelo.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/54142988371.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/tufutuxetadidunetari.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/40601903971.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/21171189568.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/0954db78f9824b966e2e2eb779f104a1/74499346334.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/nolup.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614230e59debc---diranujofu.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143da28b6b1c---kebaz.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/xifidarulosibi.pdfIn PDF document text
    • https://interconformity.ro/images/file/zokipora.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/59701160757.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/revatozulovuwuzev.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/57879632548.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/filivuvekejakolatenewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=rom+for+redmi+note+6+proPDF 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_off00011f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F72 18744 bytes
SHA-256: 66e81f056a8b4233b5036e363be8de7fdb3bea3104e78798d3b1f42df0386d79
font_01_sfnt_off00014fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000167e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167E3 10496 bytes
SHA-256: 78eef44003cd1a145c615ec233cbed2bfc147960f3a648ba31c5f24d09958e65

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