Malicious PDF — malware analysis report

Static analysis result for SHA-256 1688bf166607e068…

MALICIOUS

PDF

76.6 KB Created: 2021-09-03 09:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e1b84c1d60bb6036e2c774d9f8b4a9ca SHA-1: 175b8125583124c03cd367ba73020c73ab97ce0a SHA-256: 1688bf166607e068482f07a9c5745723e2ba3d68e9a28d23fe3c5cb23b8e206f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=fourth+industrial+revolution+skills+pdf PDF link annotation
    • https://mps-india.com/userfiles/files/miximemarozeg.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/8smo31t5aj0hjk56u13fbeq7on/venoweduwebisanaziboruxob.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430202802700653.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/roxola.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/guvisiguvedirakisomojifi.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/kasavudifufodaw.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/tunnha5g4hgd0gd9ha0tv6nbcu/nevetinazedakufupagaz.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a074537313---zexegotilopanogu.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/wedug.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/99254736300.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/p055ap4q64h5irvqui475201ob/zarog.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/bolulujujopajikupu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b75c981100c---29015605178.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/46885666680.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/g91ntq5oha3hdoftj3smck82nq/40669298080.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/95962042832.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b289f578f86---97971585653.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/sowopugedemubalulojidez.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff82372b16---xeper.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c1d5eaa9---80598839017.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/puzulawinamovaxikodapuge.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c525da7d449---17690426066.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a356c4571d0---mejamodijuwi.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_off0000c8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C8 10828 bytes
SHA-256: a243b9289eb0b74db111fb9f4494f53a751d79de9cb1e042dc82b810996bc3fa
font_01_sfnt_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 16900 bytes
SHA-256: 5219252ca8514d8cd3e1ba300e0e812f600bee6077bb0e68b285851a83b8753e
font_02_sfnt_off00010ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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