Malicious PDF — malware analysis report

Static analysis result for SHA-256 994f3a10d1427c1b…

MALICIOUS

PDF

76.0 KB Created: 2021-09-20 23:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1328da5c612608e997faf3f640844a6c SHA-1: c0fd58c70b1086c638f202fc0ebe77e3aa6dcdf8 SHA-256: 994f3a10d1427c1bcf3759d339461537af62b6ce99c49b67f4ec61508c90666d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e33dd281e---80072867189.pdf In PDF document text
    • http://autosoftware.company/autoresponders_images/files/62639498405.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/41924464589.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/xoxawunomidikojiwana.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134dc27d527e---sixetimimamaki.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef7ea41581---punubenoregekonimo.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/9006249059.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/jewaxusaxujukefulibumafop.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/desov.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/83862317133.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2fc58b4f1effa011f8dbb52317f6d2dd/12930025786.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210908013440758286.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/wadofifafuvixejagu.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/xineravu.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/33442100217.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/78556963683.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/45145916388.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/96360582853.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/31912285910.pdfIn PDF document text
    • http://grandfiltr.com/files/file/36373951085.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/95030523929.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614380755f4e4---16327711657.pdfIn PDF document text
    • https://doitoutdoorz.com/file/JPgXEOhCaOu9z3zj.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/sedadibimidigeved.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/jakogoxofufaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+pes+2021+latest+version+apkPDF 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_off0000c4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D1 10924 bytes
SHA-256: 9fcdc1dfe21413a82439657c69dd2b7b00f6ce4c659704dadb529ca08aa49ea7
font_01_sfnt_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 17032 bytes
SHA-256: b7dc68abcd45ddbc2101d3033d376f89f3b02c53f4cc25fbc645cd9cfafc62a9

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