Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbaabdd370656d59…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 07:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9524c9b5fa43de3aa86d2f3791bb6a6 SHA-1: 7e80c115466befbdcbd9b4cac6ebdd051ab0fdc7 SHA-256: fbaabdd370656d59778320e55c3186868fd261251ea7e7134e2ac25371f24b13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating non-clustered link farms on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.verneteco.com/ckfinder/userfiles/files/16472310997.pdf In PDF document text
    • http://fohow77.ru/upload/file/roraxezisuj.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/numowisodo.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/wolipatuzox.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee382c8be---96773285923.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/14819773155.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/12401001924.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/furoka.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150f2e9bad1b---17866092575.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161455dd2192b0---6448095615.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/baae880cc922d543f08cee6ca6fd0278/zifakitonifitifubufazal.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/nafovekopabujifiwu.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/belixozetadekibabaxosumij.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/85157210857.pdfIn PDF document text
    • http://strahyi.ru/images/file/58566859668.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/suvawitilolifimiv.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/88443952900.pdfIn PDF document text
    • http://tano-cable.com/d/files/24904534606.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/14922463451.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/17b320c7994c7e0717ace3f7d7e03330/fusenizon.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/mugibupe.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/sizibotolomobeg.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/18680585384.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614216f432e54---petibuwol.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/26760637914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+phone+check+codePDF 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_off0000b1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 10208 bytes
SHA-256: d039861c8192bee113d8967ce5c74dde02fa206ca6cac410dc6450a6c7048c76
font_02_sfnt_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 15696 bytes
SHA-256: fafc09772c46cc02904e9f91d380e9d34586afd8a834620416146567dc9244ed

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