Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcbcf8ee8360932…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 16:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b6d8f19c40ed23e56a0c16e4f046d4cf SHA-1: 09a1cf21b1b73b056815e6c6fea8b7a09f377522 SHA-256: bbcbcf8ee836093238336159097716077b96a0bc9158db9e92ab708ff4cdd8b7
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous external links, some hosted on compromised CMS platforms, indicating an attempt to redirect the user to malicious content or download a payload. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=manual+modulo+taramps+ts+800x4 PDF link annotation
    • http://lamay.de/userfiles/file/46371778787.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/61130047984.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/rivozekotodeveb.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366b3166128---347908953.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/sezifini.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/tuvorubedek.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090714104070554.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/99723525458.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/mozusegoxiseluniv.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/sekoges.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/biwove.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613615dbe0b62---62698319427.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/varuteporoza.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/lafapenunowutatoguzumat.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-3/20210903215838430620.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/31814228907.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161304fa39027f---23496377391.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/1161725631.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/5594312892.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/67e6959a3882da5c0b7207f9d79e9339/zetatuxuxubibu.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/72785769158.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/leguwepijosomalub.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_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 17792 bytes
SHA-256: 356b1619444d675a83753c08f259e4f03b5bd193d348858f48a42d72f5a60fff
font_01_sfnt_off00011480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C97 10932 bytes
SHA-256: eedbabb6ccfde31802cc811344f23d558427b975bb3d9ea9c68ab038a0c7b26e

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