Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9a96ccb71b6bf3…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 02:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d78a4365ff7dd4301e26a5c5209bc5a7 SHA-1: f3432b222ccfb53a541872a92462a7a353125c52 SHA-256: cf9a96ccb71b6bf3cc261d20dae7c43c0d62176c6a3cf8311049ddd5c9914ca7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://people11people.com/uploads/File/94268423992.pdf In PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/2f07a0af2866717abbb9fa0b27320412.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6bdc2daba---58453692762.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/kupatumu.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/41793420929.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/bisopujibupuduborog.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/naxusinefowaju.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/05103a5788f8c5b0a98fd16d3b4d471b/21803747729.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/vinog.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/57703578153.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/gaxul.pdfIn PDF document text
    • https://media-get.com/userfiles/files/tugeg.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e379c8f9348cea6ff5dc356745f3a59b/pisunijog.pdfIn PDF document text
    • http://snft.ro/media/file/luvenewonubo.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210911003049_iofa4o.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/fojibebozamunotewe.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/dalimorefeparigotuvofixug.pdfIn PDF document text
    • http://ihdbd.org/upload/files/92101753682.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/078c1a6b8dd344dd34f0844f5f384458/66208685675.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/fhdup5g40ukm4u63e3g6ch93nt/61679923125.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/gosukurasivurudegetov.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/badagisofasuselumaji.pdfIn PDF document text
    • http://gr-chem.com/upload/files/23383261248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+channel+is+the+boxing+onPDF 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_off0000de6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 17480 bytes
SHA-256: 44cad4a446e9601473a82ac666051163acd8eb586fcb3a4662f74242417204f7
font_01_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A0 10644 bytes
SHA-256: 85ea34a11aa5c252955a76e814b27fc808bb32fed0ff358657d12bff07c1a9cf

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