Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c20363b0a3fa28…

MALICIOUS

PDF

74.1 KB Created: 2021-09-03 19:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 01b7b0974fe5cb0a88420e3691b8de9a SHA-1: d5a18cd8ae00b66c16cae232ff2afec2049023ae SHA-256: d1c20363b0a3fa284f63c711fabc2b8ff5f8ce12e275ceb7e0d93155c56eb7ae
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites hosting PDF files. This suggests a link farm strategy designed to obscure the ultimate destination and potentially evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e60314e5c437af594b54c21129eb5d47/nuwiw.pdf In PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210512123239.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736f392e678---46632679587.pdfIn PDF document text
    • https://akvaguru.hu/user/file/66175648630.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/rofegenulobojatopawenod.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nubodanujo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb216fe0113---vekukutel.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/1066905237a60c013a1ee44765b1db40/62203730579.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/43c37254eef27d2d35ec103acf13a60f/28384213709.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/wadataxorefiwerepas.pdfIn PDF document text
    • http://wawa757.com/uploads/files/nuronomo.pdfIn PDF document text
    • http://daydala.com/userfiles/file/43530296073.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/96056018706.pdfIn PDF document text
    • https://invest.pl/userfiles/file/79240464536.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/120ca89b659f9f41da0b3c0bbce17857/sexor.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160f4bc1fdefec---wipotetebakozisuvoxenu.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7043f14f1---59216574999.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/assg4tc2ubaq6k9c5e27nf5325/50049481273.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/2kpi00er5aa42paf8bsld6smfi/dazotudepedobofejekirafo.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/xuwuloxopufir.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/89544332870.pdfIn PDF document text
    • https://andhimazhai.com/images/files/63000725929.pdfIn PDF document text
    • https://cityface.cz/res/file/91726349350.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf5e665f0---99286383139.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ac020833ec69ad1cb8afaf160cfd9344/rifixotinogubikud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=sarah+manguso+ongoingness+pdfPDF 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_off0000bf5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5B 16480 bytes
SHA-256: fc9147fb6786b226afe4b716a5698c70164c323b7985231390394e9195fa48ab
font_01_sfnt_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 10976 bytes
SHA-256: 4b868b5c5787bda68aedb5afdacac5293620b644a3b311672caa58cfdf97774f

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